The best fully synthetic 10W30 oils available
Don't just buy any 10W30 oil for your vehicle. Buy from the pioneer of synthetic oils.
A company of firsts
AMSOIL produced the very first fully synthetic oil for automobiles in the United States, hence the trademark, "First in Synthetics".
First API-rated 100% synthetic oil
first 12-month or 25,000-mile motor oil
First 100:1 pre-mix 2-cycle oil
First synthetic gear lube
First synthetic diesel motor oil
First synthetic racing oil
Why Choose Us
With lots of other engine oils to pick from, why choose AMSOIL?
High Quality Raw Materials
Our oils are over-engineered to exceed engine manufacturers specifications.
Made in the USA
Formulated, blended and packed here in the United States.
Proven best over competition
Don't take our word for it. We have our oils and the competition tested on ASTM testing machines to ensure our oil beats other synthetic oils.
Quality management systems.
Environmental management systems.
Billions of miles
Our oils have been tested over billions of miles without a single oil-related oil failure.
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What Our Clients Say
Find out why most people who switch to AMSOIL end up being customers for life
"The truck, with its six-cylinder engine, and five-speed tranny, is a workhorse that consistently hauls heavy loads through hilly territory, he said. It had 70,000 miles on the engine when he bought it in late 2005. The odometer recently turned over to 508,000 miles."