Synthetic Oil vs. Conventional Oil

Synthetic Oil vs Conventional Oil Differences Begin at the Molecular Level

Synthetic Oil vs Conventional Oil is a hot topic among many car and truck owners. Oil is a lubricant commonly used in automobiles. There are two types of oil typically used in most cars today: conventional motor oil and synthetic motor oil. Synthetic oil is made from petroleum but has been chemically refined to create a better quality of lubrication. This type of motor oil is more expensive than conventional motor oil but offers improved performance and a longer life span than the cheaper alternative. Synthetic oil may come with a higher price tag, but it lasts much longer and provides better protection than conventional oil. Synthetic oils offer a variety of benefits over conventional oils, including increased engine longevity, decreased oil consumption, improved fuel efficiency, and reduced emissions. A common misconception with synthetic oil is that it causes engine sludge to build up more quickly than conventional oil. However, synthetics are actually composed of more stable molecules which prevent sludge buildup. Synthetic oil does not break down as quickly as conventional oil and can provide 50% more miles than the average mileage of the same vehicle with conventional oil. For those who do not want to go through the hassle of changing their personal vehicle's oil regularly, they should consider synthetic oil.

Engine Protection

Only a microscopic film of oil separates metal surfaces in your engine from touching and causing wear. AMSOIL synthetic motor oils form a more durable fluid film than conventional oils due to their resilient base oils. They reduce wear and help you maximize engine life.

Extreme Temperatures


36% Easier & Faster Cold Starts

When the temperature drops, motor oils thicken and move slower, causing parts of your engine to remain unprotected for a short period of time. AMSOIL is more fluid at cold temperatures than the tested conventional oil, giving you 36% easier and faster cold starts.*

This means it can reach vital components faster, providing more immediate engine protection and reduced wear.


5x Cleaner Engines in Hot Conditions

Vehicle manufacturers are altering engine designs to keep pace with increasingly strict fuel economy standards, resulting in engines that run hotter than ever. The average operating temperature is up to 235°F, and even hotter under heavy loads. This heat can quickly break down oil, leading to oxidation, sludge and deposits.

Recent tests show AMSOIL keeps engines 81% cleaner* (5 times cleaner) than conventional oil by better resisting the formation of deposits.

*Supported by TEOST 33C test (ASTM D6335)


The base oils used in conventional oils contain molecules of different sizes and weights as well as unwanted materials, like wax. This typically requires more energy to circulate throughout your engine, which can reduce fuel economy. Conversely, AMSOIL synthetic motor oils are formulated using molecularly uniform synthetic base oils that slip easily over one another and are free of unwanted materials. They help reduce energy lost to friction and maximize fuel economy.


5x Cleaner Engines in Hot Conditions

If enough motor oil is consumed, eventually there may not be enough to reach all the complex parts of your engine, which can potentially cause damage. AMSOIL Signature Series 5W-30 showed 38% less oil consumption* than the tested conventional oil, requiring less-frequent top-offs.

*Supported by NOACK Volatility test (ASTM D5800)

Environmental Conservation

AMSOIL synthetic motor oils are designed to reduce emissions, last longer and reduce fuel consumption – all features that help prevent pollution. They resist volatilization (burn-off) better than conventional oils, which cuts tailpipe emissions, while extended-drain AMSOIL synthetic oils generate less waste oil and packaging waste since motorists use less oil throughout the year.

AMSOIL Guarantee

You can also be confident that using AMSOIL synthetic lubricants or practicing extended drain intervals will not void your new vehicle or equipment manufacturer’s warranty.