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      07-14-2012, 09:54 AM   #9
jparnes1
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Drives: 2016 340i, 2012 Z4 35i
Join Date: Jan 2010
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Quote:
Originally Posted by Atebit View Post
WRT (assuming we're taking automatic) transmission fluid, I always thought it was hydraulic fluid rather than oil. With the transmission being a closed system, IMHO there shouldn't be a need to replace it unless you've had some other transmission problem that's contaminated it or caused it to burn.
Transmission is definitely oil lubricated and there is no mechanical device in a car that doesn't benefit from changing the lubrication. It's not a closed system...the oil is easily drained like anything else. We all know why BMW recommends a lifetime fill on various parts, but that's not in your best interests if you're keeping it for a long time.
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2016 340i XDrive, EBII/black, 6 MT, M Sport, Track Handling, Cold Weather, Tech, Lighting, Driver Assistance Plus.

2012 Z4 35i, ED 2/24/2012, Melbourne Red Metallic, Black Leather, Carbon Trim, 6MT, M Sport, CW, PP, PS, NAV, CA.
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