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Old 08-10-2008, 06:15 AM
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Originally Posted by cowboytruckn View Post
That is what I am talking about. It is interesting what differentiates the various oils. Can you give us some examples of which oils fall in which category?
All the non-synthetic oils will be Group II. The synthetic blends will be a mixture of Group II & III. The synthetic oils is where the confusion starts and this is for North America only. On our little piece of real estate the oil manufactures can label Group III oils as synthetic where rest of the planet it has to be a Group IV or V base stock. Most of the synthetic motor oils we buy today are Group III with some IV added in. When the new GF-5 standard comes out in 2010; motor oils will have to be Group III to meet the standard.

Group IV
Royal Purple
Amsoil (Signature Series, ASM,ASL, & ATM)
Castrol Syntec (0W30 the one made in Germany not USA)

Group V

I am only familiar with the US brand of motor oils.

Last edited by Zonestar; 08-10-2008 at 06:18 AM.
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