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Originally Posted by MightyMouseTech
OK, read through the entire thread.... What is the actual BMW spec for the 6MT trans fluid? I will have a 135i N55 6MT. Here at Honda we use Castrol MaxLife ATF fluid in our automatic trannies. A full synthetic. Meets BMW specs LT71141, LA2634 and M-1375.4.
Edit: Nevermind, have not had my coffee yet.....
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Factory fill is MTF-LT-3. Then it went to MTF-LT-4. It might even be now LT-5 like the 1M and N55's use.
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^^Yup, MTF-LT-3 is what BMW calls for for a N54. For a N55 trans MTF-LT-5 is called for. There is a decal on the trans or a color'd sticker that tells you which fluid the trans needs.
Btw... just curious about Honda AT's... do you guys actually change the trans fluid at service intervals? 30K or 60K miles? I guess Honda doesn't believe in lifetime fluids like BMW's BS marketing.