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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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