Does anyone know what weight the old oil can numbers correspond to. the numbers on the old cans were 58, 75, and 105. I'm sure it translates to 58=50 wt, 75=60wt, and 105=70 wt. They were referred to as light wt, medium wt, and heavy. Anyone have an old service manual to say for sure?.

 

58=50 wt, 75=60wt, and 105=70wt is correct.