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Old 01-17-2013, 11:13 AM
ian@jewelorjalopy ian@jewelorjalopy is offline
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Location: Portland, OR
Join Date: Dec 2012
Posts: 28
Mein Auto: 2000 540it Sport - sold
Originally Posted by First740i View Post
V@ ian^ they can last up to 600,000 miles witch is longer then some peoples life. Never drain fluid unless it has always been done. When you drain an automatic tranny you move around a lot of metal shavings that could have been holding the trans together.

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I don't believe just draining the fluid and replacing it can remove any shavings that aren't just sitting in the bottom of the pan.

I also don't believe that flushing a transmission by using it's internal pump will cause any harm.

What I do believe is that using a powerflusher can dislodge gunk/shavings and cause issues.

As for lifetime fill, even BMW backpedaled and agreed that they really meant 100k miles. Fluid can wear out, it's an oil after all. It should be replaced periodically. Lifetime fill was a marketing gimmick, I should know, I have a marketing degree and a mechanical engineering degree so I know both side's tricks.
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