Changing Transmission Fluid - 2004 X3

[DSAviate]

Yes, JCL is one of my favorites too . . . always worth reading.

I too am planning oil changes for my "new" german tractor ('01 3.0i, 5 spd MT) with 78k.

Understanding the many pros and cons to various interval preferences under various conditions, I'm having a little trouble with the following:

1. How is it that the dark 5w30 at 6000 miles is lubricating ever bit as well as the highly translucent stuff I put in 6 months ago?

2. As the transmission gears, chains, etc. lose metal (and they do erode metal), where do those metal shavings, molecules, etc. go? My E53 has an oil filter for ONLY the engine oil, and I haven't yet located any appropriately sized drain plugs with magnetic tips to help corral these life robbing varmints.

3. Higher loads equal greater wear. Do you try to get your MXX to produce rated hp often? Are you pulling close to the 6,000 lbs limit routinely? The bits of metal fragment roaming around our transmissions, transfer cases, and differentials suspended in "lifetime oil" are taking their toll until they're drained out.

After reading the threads, owner's manual, bentley manual, and research on other sites I'll change out with the following soon with new crush washers everywhere. Would appreciate any feedback as to anyone's previous experiences with these oils in application.

Engine - Lubro-Moly 5w30, considering 5w40 ref. florida temps and frequent towing to capacity.

MT - BMW MTF-LT-3

TC - Lubro-Moly ATF III

Differentials - Lubro-Moly 75w90, considering 75w140 ref. florida temps and frequent towing to capacity.

- M54 Lover