Last Update: 10 Jan 2021

Best Conventional Oil Reviews and Buying Guide 2021

Recommended Best Product
Valvoline Motor Oil

Valvoline Motor Oil


Best Choice

Recommended Best Product
AmazonBasics Motor Oil

AmazonBasics Motor Oil


Best Value

Recommended Best Product
Castrol Motor Oil

Castrol Motor Oil


Premium Pick

James Kelly
James Kelly

Hi! This is James. I'm a professional writer and working on this field for a long time. Basically I love to write about everything related to tools, diy and home improvement. All my writings speak for itself as I'm passionate about this. I love to explore new things as well as new places whenever I get free time. You'll never find me free for this reason!

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The best conventional oil in your engine could be the difference between career and personal advancement.

This motor oil could be the secret component to saving money. It also progresses your engine performance. Besides, you may be on your way to a job interview, and you start to smell smoke in your vehicle’s engine.

It’s then you realized you hadn’t had an oil change in a long time. Conventional motor oil can help maintain your engine’s stability and general performance. Further, conventional motor oil will also help keep your car running smoothly, while protecting the parts from wear and tear. So continue reading our reviews on the top 7 conventional motor oil and choose the best one for your needs.

Top 7 Best Conventional Oil Review


Valvoline SAE 50 Conventional Motor Oil

Valvoline SAE 50 Conventional Motor Oil

Valvoline is one of the leading conventional motor oil brands worldwide.

Bye Bye, Sludge!

If you want high-performance oil, Valvoline’s daily protection, the best non synthetic motor oil, is an excellent choice. You’ll enjoy sludge-free, smooth-running engine parts every day, all year long.


The oil is a unique blend of multi-grade properties that adapt quickly to varying weather conditions. You never have to worry about cold starting or overheating, despite the climate in your area.

Havoline has a unique formula that contains non-detergent, high-quality additives that protect your engine and other parts from wear and tear.

How is it possible?

The brand features the best non synthetic motor oil on the market. It forms an ultra-thin barrier on the lining of the engine to help protect the working parts from friction.

It also helps minimize small oil leaks and enhances the engine’s overall performance. Versatility is another area to consider. You can use it in almost any make-or-model vehicle, including farming equipment, ATVs, cars, and trucks.

Key Features:


Brand                  Havoline

Dimensions        9 X 4.25 X 2.25 Inches

Weight                4 Pounds


Amazon Basics Conventional Motor Oil

Amazon Basics Conventional Motor Oil

Run, run, and run!

Your car or cycle will thank you for the outstanding performance and fuel economy of conventional motor oil on the Amazon Basics. The oil helps maintain a clean engine system by minimizing the build-up that can damage vital parts.

One feature most customers enjoy about the product is the exceptional mileage on standard oil changes. It means less wear and tears on engine parts that help saves time and money. The oil also burns cleaner for significant engine output and performance.

What is in it for you?

The product is suitable for replenishing oil levels or for complete changes when necessary. It is also an excellent way to improve your engine’s overall maintenance program. You get high mileage from a 100 percent synthetic, reliable formula.

The oil’s high-volume lubricating capabilities help protect the engine components against rust and corrosion.

No smelly fumes!

The 4-stroke gasoline engine oil provides significant resistance to thickness and temperature style failures. It is suitable for cold temperature engine performance, as well as temperatures up to 100°C.

The approval ratings are also admirable. Why is this important? The Amazon Conventional motor oil meets API approval for use in most gasoline engines.

Key Features:


Brand                 Amazon Basics

Dimensions      7.75 X 4.25 X 12.5 Inches

Weight               928 pounds




What is the best conventional motor oil for your engine? Castrol Ultraclean is the ultimate choice. It provides close to 50 percent greater protection against sludge build-up, and what’s more, it also helps enhance your engine’s overall performance.

The GTX unique formula offers significant support when gearing up to help prevent wear and tear. The many benefits make it the best conventional motor oil for your engine.

Two-pronged attack!

Your Castrol ultraclean exceeds industry standards with its dual-acting formula, which leaves your engine clean and sludge-free. The highly-stable method offers excellent protection against high-temperature fuel deposits.

The oil is available in two convenient grades, 5W-20 and 5W-30. The synthetic technology helps slow down sludge formation and build-up. It is a multi-purpose lubricator for vehicles, as well as some brands of lawnmowers.

Liven up!

If you want a free and smooth driving experience, the product is ideal for prolonging engine life. The oil also helps conserve energy. It means fewer issues on the road, especially in varying weather conditions.

Key Features:


Brand                  Castrol

Dimensions        11.9 X 9.4 X 4.6 Inches

Weight                8 Ounces


Pennzoil Conventional 10W-30 Motor Oil

Pennzoil Conventional 10W-30 Motor Oil

What is the best conventional motor oil for your engine?

It counts on your expectations and the level of performance you seek from your vehicle. Pennzoil is one of the more popular lubricating manufacturers providing oils that help make your engines more responsive.

The bodyguard!

Let’s talk about protection. Pennzoil has advanced conventional motor oil formulas that block harmful substances from damaging vehicle engines over the years.

Highly active cleaning agents also offer significant protection against sludge, dirt, and other contaminants from destroying your engine. It also helps reduce the incidence of dirt and deposit build-up.

Studies show that the lubricant provides as much as 40 percent more cleaning power even from the first oil change! You will notice cleaner engine parts and enhanced performance.

The great equalizer

Another enjoyable aspect of the oil you will notice is its ability to help balance the changing engine temperatures. The oil penetrates quickly for a cooler, more responsive engine.

Key Features:


Brand                  Pennzoil

Dimensions      14.52 X 8.62 X 13.5 Inches

Weight                9.58 Pounds


Mobil Super 112914 5W-30 Synthetic Motor Oil

Mobil Super 112914 5W-30 Synthetic Motor Oil

Mobil Super Synthetic motor oil might be the answer if you own an older model vehicle and experience frequent breakdowns. Mobil is a brand with a solid reputation for high-quality motor products for every vehicle imaginable. Here’s how the product can help you.

Purr, baby, purr!

On an older vehicle, you can expect to hear a little tinkling sound now and again. However, you’ll experience fewer breakdowns, smoother transitioning, less noise, more power, and an increase in mileage when using the oil.

Why is this?

Customers say the oil burns slower than some leading brands and offer a cleaner, more cooling, engine function. The oil helps keep the engine running efficiently, so you’ll never have to worry about towing in hot or cold weather.

Practical economics

The oil is affordable and economical, with a handy 6-pack purchase. Your next oil change can get you up to almost 7,000 miles with consistent staying power. Additionally, you’ll get excellent filtration, less sludge build-up, more engine protection, and less wear and tear.

Key Features:


Brand                Mobil

Dimensions      10 X 8 X 9 Inches

Weight               11.97 Pounds


Valvoline-882837 Daily Protection

Valvoline-882837 Daily Protection

Valvoline’s high visibility and reputation for quality and value offer oil that’s way ahead of the competition. How does this add up?

It meets and exceeds the approval ratings for excellence in areas like APSI SN and special engine grade protection from LSPI.

Valvoline-882837 daily protection offers superior quality additives that help extend the life of your vehicle’s engine. Further, it mainly safeguards against constant breakdowns in extreme conditions.

Double whammy!

The oil is available in both single and multi-viscosity formulas that help to ramp up protection in all types of weather. It quickly adapts to warmer temperatures to prevent overheating while providing 24-hour security.

One outstanding benefit is the ability of the oil to run efficiently, especially at lower temperatures. Further, it helps to conserve energy while increasing overall mileage.

Happy helper!

It is easy to use, with an easy-to-pour 5-quart container. The easy-pull tabs are a no-brainer; the anti-glug tubing and precise pouring spout help reduce spills. It’s easy to clean up small spills with soap and water.

Moreover, it provides optimal lubrication for brass or bronze fan motor brushings and is compatible with vehicles requiring APSISN rated 5W-30 viscosity.

Key Features:


Brand              Valvoline

Dimensions    8.22 X 4.6 X 12.66 Inches

Weight            9.4 Pounds


Castrol 03095 GTX 20W-50 Motor Oil

Castrol 03095 GTX 20W-50 Motor Oil

Are you worried about a sluggish, unresponsive engine? Do you experience frequent oil changes and thick, smelly leaks? Well, it’s time to switch to Castrol GTX conventional motor oil.

Here’s why?

Castrol GTX is the ideal solution to help you control sludge build-up, clunking, sticky lifters, overheating, and other daily issues. It is one of the world’s most trusted brands in conventional motor oils. It’s a reliable, high-quality product that helps reduce engine blockages for long-lasting performance and durability.

Fits like a glove!

The viscosity in the oil clings snugly to the pistons, bearings, and other engine parts for superior lubrication and protection. Stable, clean additives help with quieter running after warming up, and smoother transitions, and fewer engine noises.

Additionally, if you’re budget-conscious but still need quality at an affordable price, the product is an excellent option. It helps reduce engine failure by reducing blockages of dirt, sludge, and other harmful particles.

Sludge slasher!

The dual-action formula fights hardened sludge deposits for a cleaner, more responsive engine. It also helps extend the engine life for more efficient functioning, by preventing new sludge from forming.

Key Features:


Brand                Castrol

Dimensions     11.8 X 9.5 X 4.7 Inches

Weight              9.63 Pounds

Some Of The Benefits Include:

Things to Consider Before Buying Conventional Oil

How will you know what to buy with so many options available in conventional motor oils? They come primarily in synthetic and non-synthetic varieties. While synthetic brands may work effectively at higher temperatures, you can benefit significantly from conventional motor oils.


According to market studies, most brands of conventional motor oils may cost up to two times less than synthetic brands. Many satisfied customers bear testimony to substantial savings while experiencing increased engine function.

The age of your vehicle

Drivers know that older model vehicles tend to experience more issues than newer models. Wear and tear may cause frequent breakdowns, sludge, squeaky valves, cracks, slow starts, and smoking engines.

Using conventional motor oils can help dramatically reduce some of these issues for a cleaner, more responsive engine. Since the lubricants tend to pass through the engines at slower rates, they stick to the parts for long-lasting protection.

What type of conditions do you operate your vehicle?

Studies show that vehicle engines tend to operate differently in varying weather conditions. Therefore, the type of oil you select can make a significant difference between a cold start and a smooth operation.

Conventional motor oil helps keep engine parts well-oiled by reducing friction. If you live in cold climates, the oil may take longer to flow through, and you may get more cold starts. Conversely, you’ll need a lubricant that will flow at a quicker rate to help avoid freezing engines.

In warmer climates, your engine may need more power to operate, as it tends to burn more oil. It’s vital to keep the engine cooler to avoid wear and tear on the parts. Choose a motor oil that can help regulate oil flow in varying weather conditions to help maintain engine power in any event.

What type of protection do you need?

Most conventional oils consist of high-quality additives with significant cleaning power. Most comprise detergent-style properties that get rid of sludge, dirt, and other engine blockages. The additives also help protect against rust and corrosion.

How often do you drive?

Choose a conventional motor oil depending on your mileage. The longer you drive, the more often you need an oil change. Heavy commuting can cause sludge to build up and can cause breakdowns or overheating.


The right weight also helps the engine to utilize the lubricant more efficiently while protecting the parts from wearing down. Oil weights tend to flow a lot freer during low temperatures but may taper off at higher heats. Therefore, weights between 5W-20 and 30 are more suitable for low temperatures.

Similarly, weights 10W and over are more compatible with higher temperatures. The weight also helps you determine how often you need to make an oil change depending on the atmospheric conditions.

Conventional motor oils can adapt quickly to various temperatures when necessary. They help minimize cold starts at low temperatures to reduce wear and tear.

Likewise, in hot temperatures, the oil helps keep the engine cooler for a smooth, long-lasting performance. The product also helps extend the lifespan of the engine due to its protective and cooling properties.

Frequently Asked Questions (FAQs)

What types of vehicles can use conventional motor oils?

Answer: Most products are compatible with most makes and models of modern vehicles. These can include trucks, cars, farm equipment, lawn riders, and others.

Does the product meet industry standards?

Answer: The product receives exceptional approval ratings form leading industry players like APSI SN, LSPI, SM, SJ, SL, GF-5, and ILSAC. The products under review are among the best brands worldwide for quality, performance, and protection.

Does the product contain additives?

Answer: Most conventional motor oils contain high-action additives to help enhance the overall quality of the lubricants. The additives act to help clean away sludge, dirt, and other particles for smooth running and high performance.

Are the products expensive?

Answer: Most conventional motor oils are affordable. Many customers say the oils are sometimes cost significantly less than most comparable brands. Most products are economical and come in packages of three or six.

How long does the product last?

Answer: According to customer reviews, most conventional motor oils can last from between 3,500 and 7,500 miles in many cases. Many customers experience higher mileage and overall better performance with the products.

Final Verdict

Choosing the best conventional oil can mean the difference between the life and death of your vehicle. The oils have exceptionally high lubricating capabilities that help keep your engines cleaner for more exceptional performance and longevity.

The oils are affordable, economical, and easy to use for daily and all-year protection of vital engine parts. They help minimize friction on engine pistons, bearings, and other components while improving overall oil quality.

Each product is an excellent choice for its merit. Select the type of product that fits in with your climate to help keep the engine running smoothly.

Best Conventional Oil Reviews and Buying Guide 2021 1