2024 Duramax 6.6 Diesel Specs. Find incentives, rebates, recalls, and. 2 of mine run delo 5w40 year round and the newest one i'm trying the ultra.

Duramax’s are easy on oil. The truck’s l5p duramax diesel engine received a substantial bump in power and torque thanks to a stout list of upgrades, including a new turbocharger, improved piston.