10 Best Conventional Oil Consumer Ratings & Reports 2023

A conventional oil typically offers twice the protection as compared to regular oil.

When it’s a matter of your engine health and performance, you should only get conventional oil.

It provides fuel economy while increasing the life of old and most hard-working engines.

The biggest plus of this oil is its cost-effectiveness. It’s super affordable.

You may ask why? Well, this oil is extracted by using conventional methods. Thereby, it comes with an affordable price tag.

When you explore the market, many different kinds of conventional oils will pop up. Some oils are synthetic oil, and others are 100% conventional.

You can even find conventional oil for high mileage. I know all these terms and names are quite confusing.

Fret not, and check out my complete conventional oil buying guide to select oil as per your vehicle age, mileage, and requirements.

In this post, I am going to review the top 10 best conventional oils according to consumer ratings and reports in 2023. So without further dragging, let’s get started.


Here are the top-rated products we picked out that you would be interested in, depending on your budget…

Best Conventional Oil Consumer Ratings & Reports

I have compiled a list of the 10 best conventional oils based on consumer ratings and reports for 2023.

1. Pennzoil 550045205 5 quart 10W-30 High Mileage Motor Oil

Features at a glance
  • First oil made of natural gas
  • Reduce Damage deposit
  • Anti-Wear Protection
  • Suitable for old vehicles

Are you expecting high mileage and excellent performance from an old engine? you should invest money in conventional oil from Pennzoil.

This specific oil is well-designed, especially for late models of passenger cars, light vans, SUVs, and trucks.

Old engines are more prone to damage so that you can get protection for your machine by lubricating the parts with this oil.

It is powerful enough to reduce harmful deposits in the engine while preventing sludge formation to a great extent.

Ordinary engines cause oil leaks but not Pennzoil because it contains seal conditioning agents. They are ideal for cracked and dry engines.

Eliminating leak issues means reducing oil consumption and saving money on your fuel expenses.

It offers wear protection to engine parts and is therefore recommended for vehicles with over 75000 miles.

The ergonomic design of this 5-quart bottle makes this oil handling easy and comfy for the user.

Unlike other oils usually made from crude oil, Pennzoil’s high mileage is formulated from natural gas.

It is the first oil of its kind made from natural gas, which is known to have 99.5 percent less impurities commonly found in crude oil.

Once you start using conventional oil, you get a clean and responsive engine.

What We Like!
  • Ergonomically-designed 5-quartz bottle
  • Conventional High Mileage 10W-30 engine oil
  • Integrated with seal conditioning agents
  • Meet the latest industry standards.
Things to Consider!
  • You notice the effects after a week.

2. Valvoline Daily Protection SAE 30 Conventional Motor Oil

Features at a glance
  • Extra wear protection
  • High-quality Additive
  • Perfect oil flow and viscosity
  • Oil breakdown resistance

Many jobs require daily commute and stop-and-go kind of driving. In that scenario, you need to lube the engine with Valvoline Daily protection oil.

This conventional oil exceeds industry standards in giving your engine the most-needed protection.

No matter how long you need to drive on the highway, it will reduce friction among engine parts and keep it going smoothly.

This conventional oil is mixed with premium quality additives so that oil breakdown doesn’t happen and you don’t need to replace it quite often.

It is available in an easy pour bottle, so you don’t experience problems while changing the oil.

This conventional motor oil protects the engine from Low-speed Pre-Ignition as it meets the API SN Plus specifications.

This high-quality oil is integrated with additives that prevent sludge and deposits in the oil, so the engine stays clean and offers excellent performance.

Regardless of the temperature outside, this engine oil will flow easily. Your engine won’t choke due to dirt or grime as metal parts will remain well-lubricated.

What We Like!
  • Exceeds industry quality standards
  • Easy to Pour Bottle
  • Reduce Sludge formation
  • Good Quality Oil
Things to Consider!
  • Small Bottle.

3. Havoline 223394474 5W-30 Motor Oil – 5 qt

Features at a glance
  • Clean crankcase ventilation systems
  • Protect against LSI
  • 5W-30 Viscosity
  • Anti-Wear Protection

If you need high-performing conventional oil for extreme driving conditions or stop-and-go scenarios, then Havoline brings something that fits your requirement quite well.

This motor oil comes with 5W-30 viscosity enclosed in a 5-quart bottle. This oil provides continuous protection to engine parts against wear and tear.

If you want to start your engine at an extremely cold temperature, this oil will protect your engine and prevent its breakdown from the cold start.

This motor oil is light on your pocket but offers the same amount of sludge and deposit protection as you get with Pennzoil and Castrol brands.

Another plus of this conventional oil blend is that it offers three-way catalyst protection and extends engine life.

When your vehicle encounters a Low-Speed Ignition problem, you can easily mitigate and prevent these situations with Havoline motor oils.

It keeps your engine and crankcase ventilation system super clean since there won’t be sludge and deposit formation during extreme driving conditions.

Thanks to its high-temperature oxidation stability, the viscosity of oil won’t increase.PCV system remains clean and boosts engine performance.

What We Like!
  • Prevent Thermal breakdown
  • High-temperature oxidation stability
  • Offer Protection against cold start
  • Top-quality Three-way Catalyst protection
Things to Consider!
  • Require Frequent oil changes

4. Shell Rotella T4 Triple Protection Diesel Oil

Features at a glance
  • Ideal for heavy-duty engine application
  • Suitable for old diesel engines
  • Reduce Carbon Emissions
  • Optimal Engine cleanliness

When your vehicle runs on a heavy-duty engine, you can’t rely on ordinary conventional oil.

In that scenario, only premium quality Shell Rotella Diesel Oil does the engine protection job in the most desirable way.

It is designed to ensure guaranteed engine protection against extreme driving conditions.

This oil passed rigorous testing, so you can use it without doubting much for your latest low-emission and old hard-working engine.

The heritage Triple protection technology of Shell Rotella prevents oil oxidation for optimal performance and steady operation.

It makes sure that your engine remains clean and free from sludge throughout the oil drain interval.

Thanks to its optimal shear stability level, oil viscosity won’t increase in extreme temperatures. Hence, this oil can withstand optimal oil pressure requirements.

Anti-wear additives alongside detergent prevent deposits and increase engine life.

Old engines are more prone to the harmful effects of friction, but this high-power oil creates a solid film to protect the engine all the time.

It regulates acids in the engine to reduce contamination. Even the oldest engine can restore to its default setting via this conventional motor oil.

What We Like!
  • Exceptional Shear Stability
  • Outstanding wear protection
  • Steady Engine Oil Pressure
  • Improve emission control system durability
Things to Consider!
  • The bottle design is not user-friendly.

5. Mobil Super High Mileage 5W-30 Motor Oil 1 Quart

Features at a glance
  • Suitable for high mileage
  • Provide Fuel economy
  • Combat engine sludge
  • Improve engine life

If you need high-performance oil for your old vehicles, then the best one comes from Mobil Super. This brand is renowned for providing top-quality products.

Once you start using this oil, it will create thick protection film all-around engine parts to reduce regular wear while boosting engine performance.

This formula is specially designed for high mileage. It means you can use it when you often opt for highway or extreme condition driving.

Manufacturers mix oil with super detergent to increase engine cleanliness levels.

It combats well with sludge and deposit formation on the go. Thereby, you don’t have to encounter engine choking issues while driving.

It reduces oil consumption to ensure that your fuel bill decreases to a great extent. This powerful motor oil is good to lubricate only gasoline engines.

You can use it with confidence in turbocharged gasoline engines and any gasoline equipment for optimal quality and performance.

It comes in a 1-quart bottle that is good to go for a few months. You won’t have to change oil quite so often, so this quantity won’t diminish quickly.

What We Like!
  • Extend Life of old vehicles
  • Easy Pour bottle
  • Ideal for Gasoline engine
  • Prevent Thermal Breakdown
Things to Consider!
  • It is not suitable for diesel engines.

6. Quaker State Motor Oil, Conventional 10W-40

Features at a glance
  • Prevent and reduce leak
  • Decrease Sludge formation
  • Make engine clean
  • Oil breakdown resistance

Do you need a conventional oil that works great for your high-speed motorway commute?

Certainly, Quaker State motor oil is one you should think of getting. Inside this 5-quart bottle, you will get a scientifically formulated oil with 10W-40 Viscosity.

A quick look at its descriptions clarifies that you can use this oil for extremely high-temperature areas.

No matter what the heat level is, the oil will remain thick and prevent thinning. So, engine parts will be lubricated well on the go.

You can easily get rid of deposits and sludge formation and get a clean, healthy engine.

It offers excellent protection against wear and other harmful effects.

It is integrated with additives and inhibitors to prevent oil disintegration. It won’t break down quickly, and you enjoy peace of mind during your drive.

You can get engine protection in both warm and cold climate zones. It offers heat protection to make it ideal conventional oil to use for old and new vehicles.

Thanks to its conditioning seal, you can reduce engine leaks, and as a result, you enjoy fuel economy.

What We Like!
  • Ergonomically design easy-pour bottle
  • Suitable for the extreme driving conditions
  • Offer corrosion resistance
  • Durable wear protections for engine parts
Things to Consider!
  • Packaging my spill sometime.

7. Castrol Conventional Motor Oil 10W-30

Features at a glance
  • Great oil for high mileage.
  • Sludge protection in extreme driving conditions
  • Advanced protection against viscosity
  • Prevent thermal breakdown

It happens that engines choke pretty often due to dirt.

The excellent solution to this problem is to invest money in conventional oil from Castrol. It is formulated to prevent sludge formation and deposits.

No matter how long you run your vehicle, you won’t experience engine break as oil gets dirty quickly.

The engine is the most expensive part of your vehicle, and when you desire to extend its lifespan, you need to get oil only from reliable brands like Castrol. This brand has been serving customers for over 50 years.

It has a double-action formula to clean dust and sludge. So, the engine stays clean and offers you optimal performance.

This oil is specially designed to keep your vehicle going in severe driving conditions and heavy traffic.

What We Like!
  • Extend engine life
  • Top-quality engine oil
  • Includes anti-wear additives
  • Reduce oil consumption
Things to Consider!
  • It requires careful handling and pouring.

8. Formula Shell Conventional 10W-40 Motor Oil (Single Pack)

Features at a glance
  • Reduce engine part friction
  • Offer Best Value for the Money
  • Good Quality Conventional Oil
  • Eliminate engine contamination

Friction is the leading cause of engine breakdown. When you don’t use conventional oil, your engine parts start rusting, and it’s when you need to send the car for repair.

You can avoid expensive repair bills by relying on Formula Shell Conventional Motor oil.

This oil lubricates every single part of the engine. Perfect lubrication reduces resistance, and thereby engine encounters no damage.

Another plus of this Shell conventional oil is that it brings engine protection in extremely high temperatures.

If you travel a lot, especially in areas where the temperature is extreme, you can create a shield around your engine via this product.

Over time, dust and acid contaminate your engine and reduce its performance. Oil becomes dirty with frequent use.

So, when it comes to changing the oil, please go with this powerful product. It will reduce engine contamination to boost its performance on the move.

It is specially formulated to reduce fuel consumption and let users save money.

You can add this conventional oil in any phase of the engine life-cycle. It’s compatible with other conventional oil. So, you can mix it if you want.

This Conventional oil is suitable for small power equipment, gasoline-powered equipment, turbocharged engines, etc. At the moment, it is the most affordable oil in the market.

What We Like!
  • Offer protections in high temperature
  • Formulated to reduce fuel consumption
  • Suitable for gasoline-powered equipment
  • Compatible with conventional and synthetic oil
Things to Consider!
  • It is not suitable for diesel-engine.

9. Castrol 03102 GTX High Mileage 5W-30 Motor Oil – 5 Quart

Features at a glance
  • Formulated for engines over 75,000 miles
  • Advanced burn-off protection
  • The long interval between oil change
  • Meets and Exceed Industry Quality Standards

Do you need conventional oil for high mileage? Go and get Green Motor oil from Castrol. This GTX high Mileage oil features 5W-30 viscosity in a 5-quart bottle.

Conventional oil has a high amount of phosphorus that causes emission system failure.

However, Castrol conventional oil contains less phosphorus, so you won’t experience this failure, no matter how long you drive your vehicle.

Its latest formula is designed for engines over 75,000 miles, so you can cross highways and enjoy stop-and-go driving without experiencing engine breakdown.

Inside this conventional oil, the manufacturer has mixed seal conditioners to prevent leaks.

Your money won’t be wasted on the road as this powerful oil will prevent leakage.

It fights with optimal power with sludge build-up in the engine. Even when parts have old sludge, it eliminates this formulation and also prevents new build-up.

Manufacturers ensure that your engine parts don’t collapse with some highly advanced additives, resulting in extreme damage. Besides, you also get hi-tech oil burn-off protection.

This premium quality oil exceeds the latest industry standards such as ILSAC GF-5, API SN.

What We Like!
  • Fight against sludge formation
  • Low Phosphorus for Emission System Protection
  • Prevent Catalytic Converter Failure
  • Suitable for High Mileage
Things to Consider!
  • It is more expensive than other conventional oils.

10. STP 10w30 Pro Formula Motor Oil, 1 Quart, Pack of 6

Features at a glance
  • Available in Easy Pour Bottle
  • Works excellent in high temperature
  • Anti-wear and Anti-Corrosion
  • Save money on Fuel

Damaging effects of sludge always affect engine performance but not anymore as ST Pro Motor Oil Formula is well-built and comes with excellent wear protection.

Since your parts remain protected, it helps you spend less money on your monthly fuel.

Additives inside this Motor oil reduce your car maintenance charges. Once you start using this oil, it doesn’t require you to send your vehicle for repair.

This oil lubricates engine oil and remains thick to reduce resistance. You won’t have to experience rust, corrosion, or other harmful effects – no more spending money on repair bills.

This brand is not quite popular, but it offers good quality and performance.

This oil has passed through rigorous tests and stands the test of time. Therefore, it comes with American Petroleum Institute API certification to win the trust of its customer.

You can get this engine oil with either 5W-30 or 5W-20. It is formulated with top-quality inhibitors and cleaning agents so the engine doesn’t contaminate.

What We Like!
  • Keep Engine Clean
  • Includes Rust inhibitors
  • Comes with API Certifications
  • Protect the engine from damaging effects
Things to Consider!
  • It is only suitable for gasoline engines.

Things To Consider Before Buying Conventional Oil 

Are you going to shop for conventional oil? Please look into the following factors to get the best value for your money.

Choose A Type of Conventional Oil

When you explore different brands and check product labels, you will come across three common types. Get their info to make the right choice.

1. Conventional Oil

It is the most affordable oil available in the market. You need to change this oil after 3000 miles. When you drive in low temperatures, you should buy either 5W-20 or 5W-30.

However, 10W-30 is an ideal choice for high-temperature surroundings.

2. Synthetic Blend Oil

It is a combination of conventional and synthetic oil. You can get the benefit of both oils in one product.

When you own an SUV or Pickup, you better go with a synthetic blend because it offers fuel economy by reducing evaporation as you need to deal with heavy loading situations every other day.

This oil will be the right option as it prevents oxidation to a great extent.

3. High-Mileage Oil

This type of conventional oil is designed especially for vehicles that have crossed more than 75,000 miles on their odometer.

Yes, I’m talking about old vehicles. As their engines have been used a lot, they needed more protection than zero meters. A high mileage oil has a seal conditioner to prevent leaks.

They also come with viscosity index improvers, anti-wear additives, and emission inhibitors to improve engine performance and oil quality.


Decide what you are ready to spend on your vehicle oil. If you buy an expensive product, then topping it off will become a troublesome scenario.

You can’t keep changing the oil as it’s not an excellent strategy to maintain your engine health.

Cheap price doesn’t mean low quality, as many brands offer affordable choices to people with tight budget limits.

Motor Oil Additives

Different conventional oils have different additives. You need to understand additives to find out what kind will work perfectly for your needs and vehicle.

The purpose of adding additives in the oil is to improve its performance and efficiency.

You should understand that not every brand of oil can combine all additives. So, you need oil with specific additives that solve your engine problem.

Here are common additives you can get in conventional oil.

  • Detergents are designed to keep the piston ring area and engine clean by eliminating rust, corrosion, and deposits.
  • Antioxidants: They won’t let oil break down by resisting oxidation and thickening of oil.
  • Viscosity index improvers: When you drive in extreme temperature conditions, get oil with improved viscosity index improvers. These additives stabilize the viscosity level of oil and prevent extreme levels of thinning and thickness.
  • Anti-wear agents: They are designed to prevent the damage of standard engine parts such as cylinder walls, lifters, cams, piston rings, etc.
  • Foam inhibitors: They won’t let foam and bubbles create foam in the oil to affect lubricant power.
  • Pour-point depressants: They prevent wax accumulation during winter to maintain oil flow.
  • Friction modifiers: They minimize parts friction to improve fuel economy.
  • Dispersants: They won’t let solid particles disrupt the flow or damage the engine by absorbing them.


When you check conventional oil description and see the number 5W-30 or OW-20, you get confused.

Well, these numbers mention the viscosity. It is a technical term that measures the thickness of oil in different temperature scenarios.

In physics, oil becomes thinner in high temperatures and turns thicker in cold temperatures.

Manufacturers test the viscosity level of oil in both high and cold temperatures and then mention these numbers such as 10W-30, 5W-40, etc.

W means Winter, and the number alongside it shows how thick this oil becomes in cold temperatures.

The number after the dash suggests oil viscosity in hot temperatures.

If these terms are pretty confusing for you, then you should simply check your owner manual.

It explains what kind of oil viscosity works perfectly for your specific vehicle. Go and get that number. It’s that simple!

Product Label

It’s essential that you need to read the product label before taking it home.

Because if you don’t read it, then you may buy the wrong product that is not designed for your vehicle.

The label mentions Certifications and test details. You need to buy a product that is approved by American Petroleum Institute (API).

Also, check whether this product is environment-friendly or not. Another most important thing is to see whether this oil is suitable for diesel engines or gasoline.

Big or Small Bottle

If you go out regularly and drive the car around the highway, then a 5-quart bottle offers you the best value for the money.

However, when you drive only occasionally, you better get a 1-quart bottle as it is good enough to provide the engine the protection it needs.

There is no need to buy extra quantities when you don’t plan to use them soon.

Types of Driving

You need to consider your type of driving into consideration while picking conventional oil.

Regular car users with short city trips can save money with conventional oil.

However, when you are involved in high-stress activities where you leave town every other day, then this oil might not be a good choice for you.

In that scenario, a synthetic blend or 100 percent synthetic oil helps you enjoy a smooth drive.


If your car needs synthetic oil, but you dilute it with conventional oil, it won’t hurt your vehicle, but it might affect the quality of your synthetic oil.

So, you must get an oil compatible with your specific vehicle. You should know your engine requirement. Old engines work great on conventional oil.

Final Verdict

When you want to extend the life of your old vehicles, then the best way is to stick to top-quality conventional oil.

The slow flow of this motor oil is ideal for those hard-working engines that are taking their last breaths.

Fortunately, you can access this oil easily as every other vehicle needs it. This oil is quite affordable in comparison to synthetic oil.

You would be able to keep your engine performance up without putting any more burden on your pocket.

Some conventional oils are suitable for only diesel engines, while others are meant to keep gasoline engines up and running.

Always read descriptions carefully so you don’t end up buying the wrong oil for your vehicle.

There is no need to switch to expensive synthetic oil when high mileage conventional oil is super affordable and helps you save your money.

People Also Asked About Conventional Oil

Is conventional Oil Worth it?

They are derived from natural ingredients such as crude oil or natural gas.

Thereby, they contain much-needed properties that your engine requires, such as durability, fuel economy, and high mileage protection.

When your vehicle doesn’t need extra protection, you can opt for this oil. Besides, this oil increases the engine life of your old truck and car. So, yes, it is entirely worth it.

Is it OK to run conventional oil?

Yes, conventional oil works great in most regular vehicles. It only needs an oil change after 3000 oil.

When you have a tight budget and still want the best performance from your engine, conventional oil is an affordable choice to make.

When should I use 20W50 oil?

It is ideal for areas with warm climates. You can use this oil for high-stress activities like pulling or hauling trailers.

Besides, it works great for vehicles running in high temperatures.

How long can conventional oil last?

It is suggested to change this oil every 3000-5000 miles. However, when you invest in premium-quality, it lets you quickly drive your car up to 8000 miles.

Will conventional oil hurt my car?

No, it won’t hurt your car. Synthetic, conventional, and synthetic blends are all compatible, so they don’t result in any harm to your vehicle engine.

Can I use conventional oil for my old truck?

Yes, you can. It’s good to get high mileage conventional oil for your old vehicle as it is specially designed to deliver good performance when your engine is old.

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Ryan Collins

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