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      08-21-2013, 11:21 AM   #156
Chriztofor's Avatar

Drives: '06 325i and '13 X5
Join Date: Feb 2010
Location: Chicago Burbs

iTrader: (1)

Originally Posted by HFELIU View Post
Hey Chriztofor, thanks for the right up, nice DIY. My '07 335i has 76k miles and i'm thinking about doing a transmission fluid change with castrol. Have you noticed any change in MPG?
No problem. No significant change. I think I may also try Valvoline Synthetic. I believe it is compatible (must check the spec sheet).

When you change your fluid, give us an update. So far, no one has reported transmission failure. (I don't understand how changing old, dirty, fluid is ever a bad thing.)
If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger