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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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