One observation Re: recent (and past) oil weight discussions -- no one ever mentions single viscosities. Due to my mild climate, am very partial to straight 30 weight. And isn't this thread a bit like the recent (and past) brake fluid thread -- brand or type of second importance. Primary importance is to CHANGE IT REGULARLY. Oil touches nearly every moving part inside engine. Kindest thing you can do (and one of the cheapest) is to change frequently. No one ever hurt an engine changing oil too often. 2,000 miles is my target interval (usually ends up closer to 2,500). Don't forget -- engine oil absorbs atmospheric moisture too. Oh, while you're at it, change the air filter. For every gallon of gas burned, engine consumes something like 10,000 gallons of air. Bill Robertson #5939