Quote:
Originally Posted by Turkeybaster115
I don't even put much faith in what BMW says anyways. All they did was design the engines. They aren't an oil manufacturing company, so they actually know nothing about oil. When the E46 M3 came out they recommended BMW 5W30, and every M3 owner used it. 2 Years and a couple of blown engines later, they now recommend and use Castrol 10W 60! So, if you were one of the few, owners who noticed your oil temps were a little too high with the 30 weight junk that BMW recommended at first, then you still have your 2001 BMW M3 intact.
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They may not be an oil manufacturing company, however the engineers do know the tolerances of the running parts in the engine, and therefore know what oil/additives will make it run best. They make a standard (LL-01/04) on which oil to use, and then design parts to run around those standards. If you don't trust it, then fine use another oil, but where is your proof that there is something out there than the LL-01 oils for these cars?
The E46 M3 problem (spun rod bearings) was NEVER suggested to be a result of using 5w30, and BMW then switching from 5w30 to 10w60, there was absolutely no correlation between that. Yes the switch was done, but it was proven that they were just getting higher than warranted oil temps for those that tracked the car, so they upped the criteria. The rod bearing problem on the M3 was a whole other issue...a bad one yes, but not related to the oil weight.