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Originally Posted by Big "J"
Outstanding information!!!! Thanks for sharing this!!!
I've always heard that Mobil 1 is the "bomb" for synthetic oils and have bought their product until now.
I own an e46 (325i) as well and will convert to Amsoil too.
If there motor oil is that good, their tranny fluid should be good too, huh?
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I respectfully disagree. I don't think this is outstanding information, but rather dubious marketing information. The 4-ball wear test (ASTM D4172) is a data point, sure, but it is not generally considered very relevant to what goes on inside an operating engine. You can improve the test results with friction modifiers that have no effect on your engine. The test is run at one temperature, at one RPM, and at one bearing load. Testing at different temperatures, RPMs, and bearing loads can produce contrary results.
Instead of tests run by oil companies, promoting their own products, consider following SAE, API, and other standards. They are at least independent. The Amsoil product in question meets API SM (0-30 listed above). I use Castrol 5-30 (which additionally meets BMW viscosity specs) and it is also an SM oil. According to the API, then, the two products are equal. Both also meet GF-4, ACEA A5, GM 4718M and 6094M, Ford WSS-M2C929-A, etc. Pretty much the same from an independent test standard.
I don't think there is anything wrong at all with the Amsoil product, as it meets the above specs. I do have a problem with oil companies using these types of marketing approaches, and so I tend to not forgive them their sins, and just blacklist them on principle. That extends to all of their products, including the transmission fluid. But that is just me
IMO, any of the name brand oils that meet current specs are fine, I don't think there is any measurable difference between them. I know you can find differences in a lab, but I am not convinced that it will show up in the real world.