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      08-28-2008, 02:12 PM   #21
nicknaz
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Drives: 2012 Z4 35i
Join Date: May 2008
Location: San Diego CA

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Quote:
Originally Posted by noro View Post
Go ahead, waste your money
Actually I am not so sure about that. I can't find the links but I've seen used oil analysis that says engine oil is depleted of additives at around 10k miles, well before the 'recommended' 15k change interval.

If you want 'lifetime' to extend past the extended warranty period, I think changing the differential and transmission oil at regular intervals is a great idea. There is nothing magic about BMW transmissions and gear oils that allows them to last 'forever'. This is just a way for BMW to lower their maintenance liability and advertise lower cost of ownership

My car is leased, so whatever, I'll just do the 'recommended' free services, but if my car was a keeper, I would be changing oil/coolant/brake fluid regularly and doing used oil analysis to validate the need for the changes in between the OE recommendation