MoccasinGap
New member
Hey All, so I am looking in the owners manual for RK37 it states using (API CJ-4 SAE 10W40). But on the Maintenance Product PDF it gives a sku number for King SAE 10W30 All Fleet Heavy Duty Engine Oil 1 Gallon. I just want to stay in warranty. Or I am just reading it wrong which may be true also.