Added 3 quarts of oil to the 3.7 gas engine. Sure hoping it's the valve stem seals leaking and not the piston rings that are worn out. Small puff of blue smoke when I start it up after it has been sitting for a while. Owned it for 8 months and never did an oil change as it uses so much oil. Thinking of doing the oil filter change on the next oil top up. Also, need to get a set of valve stem seals. Anyone bought them before. Anyone changed the valve stem seals using the air compressor method or the rope down the spark plug hole. Also need a good brand name if you have bought them before.