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Old 01-14-2013, 03:05 PM
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vintage42 vintage42 is online now
BMW CCA 1405
Location: Louisville, KY
Join Date: Jun 2007
Posts: 2,521
Mein Auto: 1997 BMW Z3 1.9 5MT
I don't know about a Z4, but a Z3 does not know when you change its oil.

On a Z3 you can stick a wire into the diagnostic port under the hood per these instructions:

Also for a Z3 you can buy a foolproof tool here. It is cheap but takes 3 weeks to arrive from China:

A similar procedure and tool probably exists for the Z4, but I don't know about them.

Last edited by vintage42; 01-14-2013 at 03:10 PM.
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