Thread: Z3 Roadster (E36/7) Will it leak?
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Old 01-13-2013, 02:59 PM
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vintage42 vintage42 is offline
BMW CCA 1405
Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 1,634
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by Blacklane View Post
... You can't tell much by looking at it. It doesn't get dirty. Normally you judge when it's time to replace the fluid by looking at the odometer or by the feel of the shifter.
Transmission and differential oil can get discolored and dirty from internal wear particles from the gears, bearings and syncros, and can also degrade from shear and heat. In most cases and vehicles it takes a lot of miles and years. BMW evidently thinks the manual transmission can go forever without a change.
But when I changed front and rear differential oil of my new Subaru at 10,000 miles, I was surprised at how much darker the rear oil was.
I don't know if the feel of the shifter changes due to miles or age of the fluid. The feel is more likely to be affected by worn shifter bushings and pins than old fluid. But a quick change can be made in feel by using a different fluid. I think my low mileage 1.9 shifts easier merely from putting in SynchroMax fluid.
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