So your owner's manual requires the use of 0W-40 to maintain your warranty?
It's just really weird to require a specific grade, the only other ones I know of are Jaguar and the BMW requirement.
Originally Posted By: 440Magnum
It does indeed. All the SRT v8s (the original 6.1 Hemi like SteveSRT8 has in his 300, the 392/6.4 like I and 392Hemi have in our cars, and the new Hellcat) are spec'd for 0w40 oil. Factory fill was Mobil 1 0w40 until FCA changed oil suppliers from XOM to SOPUS. For one model year, SOPUS had no 0w40 oil so a 5w40 was spec'd (Pennzoil Euro 5w40), then they rushed Pennzoil Ultra "SRT" 0w40 out, and that's been the FF ever since. Once the new GTL PU is available in 0w40 at retailers, I'll try it but I currently use Mobil 1 even though my car came with Pennzoil. Its really hard to beat Mobil 1 0w40 right now, either for durability or availability.