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Old 08-27-2010, 01:15 PM
gahawkins gahawkins is offline
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Location: Rochester, NY 14506
 
Join Date: Jul 2009
Posts: 20
Mein Auto: 1991 M5
The rich mixture seems odd to me, but the valves should be adjusted when they "are out of adjustment" for other reasons, including damage to the valves and seats. The trick, of course, is to know when they need it. You can just do it at the frequently specified intervals, which is expensive, or develop a good ear for the sound of poorly adjusted valves. My independent shop guy suggests the latter, and further feels that once the engine has settled in (maybe 50 K miles and one or two valve adjustments) it may not need adjustment again for a very long time. I have followed this advice on an E34M5 now with 140K; the last adjustment was at 60K. Neither me nor my mechanic can hear any unexpected valve noise and the car continues to run very, very well.
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