Quote:
Originally Posted by E90Fleet
Look at the latest parts system updates
The X1 20i and Z4 20i engines changed from December 2011 to the N20 used in the 328i. Exact same part number and parts.
Earlier engines were different
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How abt compression ratios? Yes, the X1 20i & 28i both have 10:1, but 320i/520i & 328i/528i still have 11:1 vs 10:1.
According to ETK 2/2012, 1/2012 production 520i & 528i still use different blocks unless for low compression markets.