Well I'm working on getting the old Yamaha back in shape (YFM200 Moto4). I need to change the oil, so I called the Yamaha Dealer to ask what to put in it. They tell me 20w-40? I assume that only Yamalube comes in 20w-40 because I can't find it ANYWHERE. Would a 10w-40 work? or should I go with a 20w-50?
Thanks!
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