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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 12-03-2005, 11:50 PM   #21
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Join Date: Aug 2005
Location: Fairfax, VA
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My Ride: 04` 325i
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what do you guys think of Mobil 1 syn 75w/90 in the tranny?
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Old 12-04-2005, 12:20 AM   #22
Join Date: Jul 2005
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no dude you dont put gear oil in our manual transmissions, you use ATF fluid,

like royal purple synchromax thats what i use
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Old 12-04-2005, 06:18 PM   #23
Tom Busby
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My Ride: 2001 325i, 1995 318i
Last week I put in some Lubrication Engineer's ATF in my '01 325i 5-speed. I wanted to try LE's 700 non-synthetic ATF. They make a lighter synthetic ATF called 1150 also, but I decided the non-synthetic ATF would be best. LE appears to be a great company, went to the Moon, etc. GM uses their "monoblock" gear oil when a customer complains about noise from the rear differential.

The cold-running shifts are the same. The hot-running shifts are lighter and smoother, especially the 4-5 shift.

I have tried synthetic AmsOil, Valvoline, Mobil 1, and non-synthetic Havoline ATF, all in a '98 6-speed GM transmission that now has about 105,000 miles. The ordinary ATF was and is the best.
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