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The BMW Range
3 Series
Gearbox oil - issue to be settled once and for all ?
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<blockquote data-quote="pujiesss" data-source="post: 209539" data-attributes="member: 4720"><p>Question : </p><p>I'm not arguing against transmission maintenance but how does BMW get away with sealing their transmissions on all 3 Series newer than 1999? </p><p>I understand the fluid doesn't even have to be changed. Please correct me if I'm wrong, but if I'm correct, please explain how they can do it?</p><p></p><p>Answer :</p><p>The torque curve on the M52tu engines is pretty flat, peak torque@3500 rpm and the GM 5L40 has smart BMW programming. So that the torque converter is locked up more often than not. So the primary heat source of transmission fluid [torque converter] is eliminated. Infact BMW and Mercedes use a long-life Hydraulic fluid instead of regular transmision fluid.</p></blockquote><p></p>
[QUOTE="pujiesss, post: 209539, member: 4720"] Question : I'm not arguing against transmission maintenance but how does BMW get away with sealing their transmissions on all 3 Series newer than 1999? I understand the fluid doesn't even have to be changed. Please correct me if I'm wrong, but if I'm correct, please explain how they can do it? Answer : The torque curve on the M52tu engines is pretty flat, peak torque@3500 rpm and the GM 5L40 has smart BMW programming. So that the torque converter is locked up more often than not. So the primary heat source of transmission fluid [torque converter] is eliminated. Infact BMW and Mercedes use a long-life Hydraulic fluid instead of regular transmision fluid. [/QUOTE]
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Gearbox oil - issue to be settled once and for all ?
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