New AMSOIL DOMINATOR 10W-40 Synthetic Racing Oil is a durable formulation designed to provide maximum horsepower without sacrificing engine protection in racing and high-performance applications.

Learn how to protect your vintage flat-tappet–equipped engines by using the correct oil, like AMSOIL INC. Synthetic 10W-40 Premium Protection Motor Oil!

AmsOil The AmsOil Premium Protection 10W-40 (AMO) and 20W-50 (ARO), and racing oil 20W-50 (TRO) are higher-viscosity oils that contain high levels of phosphorus and zinc anti-wear additives.

The first can of Amsoil 10W-40 appeared on the market in 1972. Amatuzio has received numerous awards since founding Amsoil. He was inducted into the Superior Business Hall of Fame last year.

AMSOIL SAE 0W-40 Signature Series Synthetic Motor Oil Available at: Find locations through amsoil.com Price: $11.50 (U.S.) 10W-30, 5W-20 or even 0W-40. Picking the right viscosity for your engine ...

A quart of Amsoil Signature Series 10W-30 Synthetic motor oil sells for $10.15). So how is a $10 quart cheaper than a $4 quart? It isn't. That is, of course, until you consider drain interval.

Amsoil Amsoil has a complete line of diesel engine synthetic oils. The line features the Signature Series Max-Duty Synthetic in 5W-40, 5W-30, 10W-30, 15W-40, and 0W-40 grades.

When we learned that the Amsoil Dual Remote Oil Filtration System, in combination with its full-synthetic 15-40 Heavy-Duty Diesel & Marine Motor Oil, could safely extend oil changes up to 60,000 ...