Re: Hey Jim...some elucidation

[Land Shark <lndshrk@xxxxxxxxxxxx>]

At 10:22 AM 10/20/98 -0400, you wrote:
>    Humm,
>    Let's examine some other variables,
>    The car was running on Mobil 10W-30 before and was running a little
>bogged down.  I changed the oil and it was running nice until about now
>(1500miles later) where it seems to have lost its spirit).  OK, I now
>know that it's not the chip.
>    Other variables are:
>    Some bastard (not me) accidently slightly over-reved my engine
>(mis-shift).  Now, the performance difference is negligible so I was
>guessing that this mis-shift did not cause the slight loss in
>performance because the car did the same thing last oil change around
>this time???  Any thoughts..  ??  Will a dealer be able to diagnois any
>problems?  Will they be able to detect your chip and decide to void my
>warranty?  Thank you for the help, adios. Mike.

 The overrev will blow your warranty.. a simple compression test on each
 cylinder will tell the tale.. no need for a dealer on this one...

 You'll most likely find one or two cylinders with less compression than
 all the rest, indicative of a bent valve or two..

 It takes even less with a 325i than an M3 since the 325i has weaker 
 valve springs (and hence valves float easier)..

 This is the reason why my chip has a 6800 rpm redline vs. other 
 people who use 7000 or higher..

 Jim

 PS: If oil changes are causing "loss of performance" you should be
     looking for an air leak that the oil change caused, like a faulty
     dipstick or oilcap seal.

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