Any oil that is not MA rated could cause your clutch to slip. Todays typical automotive oils contain friction reducers which are not compatible with our oil bath clutches. If you have filled your crankcase with one of these oils I would recommend you change it with an appropriate oil, ride it 10 miles or so, then change it again.
You could search the forum (or the internet) for discussions on what is the best oil to use, but don't do it unless you have a very comfortable recliner and a well stocked cooler.
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