If I’m even close to remembering putting my 284 together it takes around 3 Gallons. A couple liters shouldn’t effect it much at all, especially during the summer, and I doubt you raised the AW32 to more than AW 36 or so only adding a couple liters, JMHO. Bob Rooks will be more knowledgeable in this department
Yep, you’re good, although it won’t make a multi-grade because it lacks formulation (base stock hydrocarbons aren’t linked). I use multi-grade ISO AW 32/46/68 hydraulic oil in all my equipment. It not only saves on inventory, but satisfies operating temperature requirements.