I snagged 2 closeout gallons of Rimula 30 for $1 at Advance. There are no gas specs and it says "for severe duty diesels" or something close to that. I'm thinking it has higher additive levels than API SJ or whatever, so it's not mixed-fleet. I'll use a gallon for topping off SOPUS oils and gave a gallon to my friend for the same thing. I would consider using it for the cycle, but have other oils for that.