In some years past I have used Mobil 1 15W-50 Gold cap in my bikes and it worked well. Then I started using regular oil but lately I have been having a hard time finding it in 10W-40 I'm guessing because most cars use the watery stuff now. So they had Mobil 1 but it had a silver cap instead of the gold. Can anyone tell me if it is the same thing? Is anyone here using it in their bike and no clutch issues?