Amsoil is the first, best, and original synthetic oil company. Read more, and make come to your own conclusions.

In 1972 AMZOIL became the first synthetic motor oil in the world to meet American Petroleum Institute criteria. Many others have followed but as recently as a few years ago some major manufacturers still were in denial of the benefits of synthetic oil. Now, it's becoming more and more common. These synthetic oil comparisons will help you decide Amsoil is best.

Amsoil is still the best.

After numerous comparison tests over the years, Amsoil has continue to demonstrate it outperforms other synthetic oil. Please review the comparison tests below to learn more.

Amsoil Fuel Economy Test
8.2% fuel economy increase with synthetic oil. Read the story.

Amsoil Gear Oil Comparison
Fourteen of the most popular brands of gear lube were tested at an independent laboratory in areas such as pour point, 4-ball EP weld point, 4-ball EP load-wear index, Falex extreme pressure and many other tests used in meeting API GL-5 performance requirements and SAE J306 viscosity requirements.

Synthetic Motorcycle Oil Comparison
Exhaustive comparison tests of 14 of the most popular motorcyle oils.

Engine Oil Comparison
11 popular engine oils compared through a battery of tests. The competing oils included petroleum-based Castrol GTX, Chevron Supreme, Havoline, Formula Shell and Pennzoil, as well as synthetic-blends Trop Artic and Motorcraft, and full-synthetic Pennzoil Platinum, Quaker State Advanced Full Synthetic and Mobil 1 Extended Performance.

Amsoil API Sequence IIIF Test
Subject AMSOIL 10W-30 Synthetic Motor Oil (ATM) to an independent API Sequence IIIF Test to determine its effectiveness in preventing deposit formation and providing wear protection in high temperature conditions.

Once you have read the comparisons, take the next step and request a FREE, no obligation Amsoil catalog. We will mail one to you USPS to your door.