I found the link that I mentioned above. Great information on lubes. It all started from a newspaper article about "Pickup Truck Records One Million Miles on PennzoilŪ Motor Oil". I started using Castrol GTX when I was 15 (good father), then I switched to using Synthetic (Castrol Syntec or Mobil 1), now after reading this article I'm looking for a new Synthetic oil to use for my next oil change.

Pickup Truck Records One Million Miles on PennzoilŪ Motor Oil

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Thanks,
Dave

1998 BMW 540i Sport
1995 E320
1992 400E
1989 BMW M3
1979 Triumph TR7 (1st car)
1986 BMW 735i (Sold)
1980 BMW 320i (Sold)