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Old 01-11-2020, 09:06 AM
Effduration Effduration is offline
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As noted any 3.0 M54 engine (in the US they were found in E46, E39, E53, X3 and Z3) will fit in the X5.. Use the X5's harness. You will also likely have to use the X5's oil pan.

I have torn apart/rebuilt several M54's. .The only one I saw with a burnt piston (from an X5 actually) had cylinder wall scoring from frozen/damaged piston rings that prevented me from re-using the engine block. I tried honing the cylinder and that didn't smooth it.
It would have required a new cylinder liner and at that point a used engine was for more economical
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