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      02-01-2011, 04:49 PM   #33
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Drives: E90 325i sport manual
Join Date: Aug 2009
Location: Scottsdale, AZ

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I'll probably go with pure D4 ATF next though as I think it'll be better for, on average, colder climates such as Canada
Redline D6 is closest to the factory fluid (MTF-LT-3), and now recommended by RL for our gearboxes, it's about 10% thinner than D4. Warmer climates, you won't notice a difference, but in Canada you will.

Gearboxes are manufactured with tighter and tighter clearances, requiring thinner fluids.

Last edited by AlanAZ; 02-01-2011 at 11:19 PM.
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