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My friend left me a 2005 Smart Roadster (95000km) that has an engine failure. During normal driving he suddenly lost some engine power and looking back he saw plenty of smoke. No abnormal noises however. He stopped driving and the car was towed to my place. Oil was a bit over minimum. Cold compression test resulted 17.5, 15.8 and 17 bars. Reason is that all cylinders seem to be full of oil. All plugs were very oily, rightmost plug was soaked with oil. Engine starts and idles fine but it smokes a lot.

I think it is pretty safe to say that piston rings are bad and the best option is to drop the engine and open it up, would you agree? I only wonder why every cylinder has the same issue (oil), did it overheat at some point and ruined all rings?

Before I open it up, any ideas to further diagnose this are much appreciated,

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