Blow-by (Combustion pressure going by the rings) can be caused by overheating the engine and cooking the life out of the rings. Also from rarely changing the oil which carbons up the rings, makes them stick, which lets the gas go by. Running the engine too cold for long periods of time. merCur - Free download as PDF File (.pdf), Text File (.txt) or read online for free.
Oct 26, 2019 · Just used all methods above and freed up Mercruiser 200 that sat for 2 years with oil drain pug removed and water filling up the oil pan. Mix 1 part MMO, 1 part WD-40 Specialist, 1 part PB Blaster and 1 part ATF -the cheap stuff works just fine as you will be draining.