I just changed my oil in my 74 for the first time today. It held 3 quarts. I bought 4 because I wanted to make sure I had oil on hand if I need to add some. A friend of mine told me to drain the oil out of the bottom of the tank, there´s a drain bolt there. (right over my exhaust)What I need to find is a new oil filter for mine. Let me know if you know where I can order one.