I've got a problem. first some info. I have a murry with a twin cylinder 17.5 briggs motor. It will run good for a while , after it gets hot(or maybe after it just runs a while). The motor suddenly loses power. Yes it's lost a lot of oil, it's running down the main body of the engine under one of the cylinder assemblies. It does not appear to be coming out of the head or head gasket,but closer to the main body of the engine. cracked cylinder? cracked block?could it be leaking around the seal and bushing under the flywheel? The motor starts and runs good, no excess vibration etc. Any help and ideas will be greatly appreciated. g. matlock