Thought some on here might be interested in this information.
Took the time yesterday to do some maintenance that I thought was appropriate, no matter what the official BMW stance is on the subject (3 year fuel filter change interval and “lifetime” transmission fluid . . . Both seem too long to me).
First attached pic is of the car up on the lift as the new fuel filter is beling flushed. Was curious if there was evidence of water trapped by the filter. Good news is no free water found. This could mean a couple things: 1) The truck stop used for >95% of fuel must do a good job of keeping free water from their tanks. 2) The fuel filter doesn’t do diddly for stopping free water. Hope #1 is the reason.
Second picture is a comparison of the old transmission fluid to the new fluid (ZF Lifeguard 6 as recommended by the transmission manufacturer). Was a bit surprised at the color and smell of the old fluid at <30,000 mls. Glad it was decided to do a fluid change this early. Considering not all the fluid gets refreshed with the approach used think a 2-3yr change interval will continue to be used on this vehicle.
2011 335d 11.8 sec 120 mph 1/4 mile NHRA certified track
2004 Ram Cummins with lots-o-mods