In independent, third party testing, AMSOIL has pitted their Signature Series 5W-30 Synthetic Motor Oil against synthetic offerings from nine popular competitors.

These competitors include :

  • Mobil 1™ Extended Performance
  • Royal Purple High Performance Motor Oil
  • Lucas Synthetic
  • Red Line High Performance Motor Oil
  • Castrol Edge® with Titanium Fluid Strength Technology®
  • Pennzoil Ultra™
  • Petro-Canada SUPREME Synthetic™
  • Quaker State Ultimate Durability™
  • Valvoline SynPower® Full Synthetic Motor Oil

AMSOIL Signature Series 100% Synthetic 5W-30 Motor OilThis stacked field of 5W-30 synthetic engine oils were put through their paces in a series of five different American Society of Testing and Materials (ASTM) recognized testing protocols. To remove any possibility of bias, the samples were coded and tested in random order.

The motor oils were tested to determine resistance to depositing, wear control, high temperature stability, resistance to acid formation and cold temperature performance.

As usual, AMSOIL fares very well versus the competition. The cynical among us may question the veracity of the results, but keep in mind that the publication of phony test results would result in a heap of legal troubles. AMSOIL has been “naming names” for 40 years and has their data has never been challenged.

See the complete test paper: A Study of 5W-30 Synthetic Motor Oils (420KB PDF)

Buy AMSOIL 5W-30 100% Synthetic Motor Oil at wholesale in Canada or the United States. Request a wholesale price list using the form in the upper right of this page.

Buy AMSOIL Signature Series Synthetic 5W-30 Motor Oil at the lowest price in Canada or the US from Oildepot. 1-800-748-5781
Brand: AMSOIL
Manufacturer: AMSOIL
Model: ASL