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  1. This week I got my oil change done at the ULM club. The guys changed the oil, oil filter and spark plugs. I flew something like half an hour after the engine was serviced and noticed the following three points: - After the 30 minute flight I let the engine rest and then turned the propeller manually to gurgle and gauged the oil. It showed nearly one cm above Max level. Is that bad, or dangerous, or shall I leave it because it won't stay there all the time anyway? - Turning the propeller manually I also noticed there was les compssion in the way that I felt far less resistance than before the oil change. Indeed, the propeller now turns much easier and smoother manually. - Last thing I noticed was that during takeoff the engine showed way less nerve and climb rate was low compared to before. Any clues as what all that can be due to, and how best to recover the brilliant behaviour the engine had before the oil change? for information the engine has 600 hours. Many thanks for stopping by and for sharing your valuable thoughts.