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My 2013 X3 N20 engine with 38,00 miles had several issues including sludge in the engine and multiple Vanos failures.
1st problem: turbo oil leak causing excess smoke upon startup. Oil line replaced under warranty.
2nd problem: failure of replacement oil line which was a fix for problem #1 causing an oil leak and engine fire. Fire damage replaced under warranty.
3rd problem: drivetrain malfunction with multiple Vanos failures caused by sludge in engine. Engine replaced under warranty.
I loved my 2007 X3 with 167,000 miles. The 2013 X3 handles much better but I am not sure it will last 100,000 miles.
Best of luck
George
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