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      02-01-2011, 05:07 PM   #30

Drives: 2009 135i 6MT
Join Date: Feb 2010
Location: Maryland

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2009 135i  [3.25]
Originally Posted by rbrown81 View Post
Mr 5

I noticed the D4 AFT is recommended by Redline for late model BMW manual transmissions, but do you know why it is recommended over and above the MTL 70W80 GL-4 Gear Oil for manual transmissions?

Anyone know the difference?
Probably most of you have seen the "Alternative BMW Maintenance Schedule" by Mike Miller of Roundel Magazine. I don't personally know anything about gearbox oil, but he says:

All the BMW gearbox re-builders I know use Red Line MTL exclusively, regardless of model year or gearbox. The general consensus is, MTL is the better lubricant. However, the D4ATF product will require less shifter babying during cold operation. I use Red Line MTL in manual gearboxes except where I canít trust the driver to shift properly when the gearbox is cold, in which case I use Red Line D4 ATF.