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Keep Your Engine Cleaner

AMSOIL Signature Series has 50% more detergents² to help keep oil passages clean and promote oil circulation. It provides 90% better protection against sludge³ to keep your engine clean and long-lasting.

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Maximum Fuel Economy

AMSOIL synthetic motor oils are formulated using molecularly uniform synthetic base oils that slip easily over one another and remain fluid in cold temperatures. They help reduce energy lost to friction and maximize fuel economy.

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Change Your Oil Less Often

With AMSOIL synthetic lubricants, you put more than industry-leading oil in your vehicle – you put time back into your schedule. Our extended-drain lubricants let you safely go longer between oil changes if you want, saving time spent on maintenance.

Enthusiasts Love AMSOIL

"I only use AMSOIL for my vehicles. 13 years and 250,000 miles later, still running smooth. Thank you."

Scott, Verified Buyer

Why AMSOIL?

We design our synthetic lubricants to exceed the toughest performance standards so enthusiasts like you can maximize the power, performance and life of your vehicles.

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Blog Post

Synthetic vs. Conventional Oil: The Definitive Guide

You probably know that synthetic oil delivers better protection and lasts longer than conventional oil, but you may not know how. We break it all down for you here.

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AMSOIL Disclaimer and Technical Concerns

Specifications contained on this website are based on manufacturers' information and were believed accurate at the time of publication. Our recommendations apply to AMSOIL products only, as we cannot be responsible for products from other manufacturers. Always compare fluids and lubricants that were installed in the vehicle with those replacing them during service. Never install more fluid or lubricant than what is considered adequate according to gradients on dipstick or level of filler hole. Fill and drain locations are for reference only. Failure to perform adequate inspections or obtain proper resolution will limit or negate any liability toward AMSOIL INC. Models introduced midyear may not have the same specifications as those produced earlier.

If any discrepancies are noted, they can be simply reported to AMSOIL by clicking on the "Problem?" link docked to the left. We review all reported problems, if you would like a personal response to the issue you are reporting please enter your email address in the space provided on the form.