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Old 01-08-2013, 03:47 PM   #37
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Join Date: May 2006
Location: Texas
Posts: 424
My Ride: M3, X5
Originally Posted by Yewzer B Lewzer View Post
Dumb question from new E46 owner: Do regular 325i's need valve adjustment or is it just the M's?

"There is no such thing as a stupid question, just stupid people that ask questions"
The reason the M3 needs it and the 325i doesn't is because the M3 S54 engine uses mechanical lifters. These lifters shift slightly as they are banged against but have the advantage of working faster and able to rev up to the 8k+ rpm range. The 325i M54 uses hydraulic lifters that automatically shift over time.
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