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As far as I know the oils that need changed is 1. Engine oil which also lubes the "transmission" 2. The front differential 3. The real differential. When changing the engine oil, I took the top hose off the oil cooler and used cheap, low pressure tire inflator (12v that plugs into cigarette socket) to blow the oil back through the lines. Then out the oil drain plug. It takes just a little more oil when changing. But 99% ( + - ) of the old oil is removed from the machine when changing oil.

Do not use full synthetic automotive oils..you will fry the wet clutch..

I went down a rabbit hole with mine a while back, turned out to be just a bad fuel issue.