I've tuned my Ineos Grenadier and it's also running larger 34" tires. I've been running LL01 Quaker State Euro 5w40. No complaints there but wondering if I need to shift to a different oil since a lot more power/demand will be coming out of the motor. I've been doing oil changes every 5k miles, manual says 12k intervals with 0w20 but I don't trust it. I'll be heading out to Moab again where it's very hot and won't touch 0w20.