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Old 02-15-2013, 02:37 PM
bmw325 bmw325 is offline
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Location: New York, NY
Join Date: Dec 2001
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Mein Auto: 528i
Actuallly the 128 and 135 engine don't share much in common (turbocharging aside)
-The 135 is direct injected, while the n52 in the x28 models had port injection (the direct injection was the source of much trouble w/ the 135/335 models)
-the 128 has a magnesium and aluminum block for lightness while the n54 in the 135 has an all aluminum block
-Even the bore spacing and dimensions are different

Overall yes, the 128 had a much more reliable engine and there's less to go wrong (no turbos and no direct injection).
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