1988 5.7 merc with Apla 1. I changed my engine oil yesterday. The oil on the dipstick looked clear and decent but what I pulled out looked light brown. I bought the boat from my friend a couple years ago who had the top end of the motor rebuilt two years before I bought it and the head gasket was replaced then. This year will be three to four years past that repair. Is there a test I can do to see if the head gaskets are bad?
Otherwise all I know how to do is check the oil on the dipstick after each lake day. Since the dipstick came out clear the first time I am not 100% confident I am seeing a problem by using the dipstick method.
Otherwise all I know how to do is check the oil on the dipstick after each lake day. Since the dipstick came out clear the first time I am not 100% confident I am seeing a problem by using the dipstick method.