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Old 11-15-2012, 04:25 PM
Jimmys 530i Jimmys 530i is offline
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Location: Conyers, GA
 
Join Date: Feb 2011
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Mein Auto: 2003 530i
With cylinder 4 at 25% leakdown, you are right at 135 psi compression. Tolerance for leakdown is about 10-12%. My educated guess is that the head is warped a couple of mills, and the threads in the block pulled out.
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