I found a lot of water in my oil today The color of the oil is grey,and the oil is now overfilled by about 1 Quart. The engine is a 1977 MD7A which has always been cared for and alaways ran like a swiss watch. Is is possible that the seal in the back of the raw water pump could have gone bad which would pump water into the engine,or is it more likely that the block or the head has rusted from the inside out.