Straight weight oil is your best bet for air cooled engines; the viscosity modifier in multi-weight oil breaks down with heat. If you decide to convert a high hour engine to synthetic change the synthetic oil sooner than you normally would inasmuch as its high detergent action will be cutting a lot of varnish and as others have mentioned the oil control rings will have trouble. There are two types of synthetic oils; group III and group IV. Group IV are superior in that they are polymerized to form consistent molecules from natural gas. In a new air cooled engine you will have better success from using a synthetic group IV oil. It will provide higher temperature protection; quicker lube on start up; and more consistent viscosity.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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