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|3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.|
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yes, drain and fill even with lifetime fluids you need to change. have you ever heard what lifetime in milage meant? although there are serveral debates on this topic lifetime usually means 100,000 - 150,000 miles after 150,000 I would change fluids and filter (and clean magnets) because I have seen where the magnets look like they cannot pick up any more matelic sludge. then the filter gets clogged . all transmissions will wear and have matelic sludge. If you ask the dealer they will tell you NEVER change lifetime fluids. It is sort of a debate . PERSONALLY I would change at 100,000 - 150,000 miles as regular maint. If you have transmission trouble changing fluid will not help whatever damage is done is done and has to be fixed. Pull the trans and fix before it gets worse!
I've flushed my transmission every 30,000 miles or 2 years. Usually, it's every 2 years because I don't drive more than 8,000 miles per year with my car. You'll definitely notice an improvement after the old fluid is removed and is replaced with fresh new fluid.
Interesting you asked that question, because the last shop I took my car to had a machine that apparently can remove all of the old fluid while adding new fluid. I go to a different shop now so I'm doing it the old school way by just replacing the fluid and filter. Either way, as long as a majority of the old fluid is removed and new fluid is added along with a new filter it doesn't really matter.
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