If your cart does not have an oil filter (Yamaha) then it is wise to use the oil drain plug rather than a topsider. If you use a topsider then warm the engine before draining to force containments into suspension.
Synthetic oil is saturated and therefore does not oxidize...It is its only advantage. Since it is saturated, it cant hold contaminates in suspension which is a disadvantage. Just use a straight SAE 30 for shear stability and cleanliness in an air cooled engine...4 bucks a quart at Walmart.
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