If anything the old school mentality was never to use any oil other than mc oil. I’m sure everyone has a friend who’s grandma had a clutch slipping problem in 1972 when she used car oil. We’re talking about a 30 hp bike here that’ll be rode lightly, not a motocrosser. I’ve used hdeo (diesel motor oil) in all sorts of bikes up to 150 hp sportbikes (including many track days) and never had an issue nor have I ever personally heard of anyone having an issue due to not using crazy expensive motorcycle specific oil. If your clutch starts slipping and you think it’s the oil something is wrong with your clutch.
It’s your money guys. Spend it how you want. Better yet, educate yourselves and I’m certain you’ll start saving a lot of money on motor oil.
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