Low Compression N55

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		BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) > Technical / Specific Topics > 135i Turbo Engine (N54 / N55), Exhaust and Drivetrain Modifications
Low Compression N55

03-20-2025, 06:30 PM	#1
sam135 Registered 0 Rep 2 Posts Drives: 2011 BMW 135i Join Date: Mar 2025 Location: California iTrader: (0)	Low Compression N55 Hey there, I have a 2011 BMW 135i with a n55, 6 speed manual. Did a compression test and confirmed its around 151-154 on all 6 cylinders. Not sure where to go from there, the test was done cold and just unplugged the fuel pump. Its technically within service limits according to BMW, but I'm not sure why its so low. Car has 166k miles.
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