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Message: <blockquote data-quote="LCP" data-source="post: 206334" data-attributes="member: 2424">Any loss of oil? Any idea what's the engine oil consumption like... 1 litre every 1000km? Or worse? What's the condition of the spark plugs, are the electrode tips oily? Anyway, with the low compression on one cylinder, it could be any of the 3 items you listed, and one more... piston rings on that particular cylinder, especially if you have oil on plugs. Damaged or worn piston rings can damage cylinder walls, the absolute worst case is you have to re-bore... that would be fun, by going +0.5mm (yes, all car manufacturers do sell bigger pistons to cater for re-bored cylinders, I think BMW has oversize1 (+0.25mm) and oversize2 (+0.5mm)), you will get... crunch crunch 85.5mm bore, 75mm stroke, 6 cylinder.... 2584cc.... which will mean a bit more torque...</blockquote>