I have 252 hours on my boat and it has always use bout one quart of oil every 10-15 hours. Shops have told me that is not bad, but I know that my old boat did not ever use any. So this year well they are doing some other stuff to my boat I had them pull the plugs and found one that was black from burning oil. So they did a compression test and found low compression in that one cylinder 160 compared to 190-195 in the others. There telling me that PCM will have them pull out the motor and on that one cylinder hone it, new rings and put it back in. This dose not sound good to me .Is this the way they fix this problem?