I drive my 1949 Chevy Truck about a 100 miles per weekend. I have to put a quart of oil in every 300 miles or so. It isn't smoking, but underneath the pan and vent tube side its all oily. I've had all the gaskets replaced. It runs great, I put about 4,000 miles a year on it just running around. I want to correct this, can this be done, or do I need to rebuild the engine? Where's it leaking all the oil from?? SIG