Here is FCA's oil recommendation for the Hellcats. The issue that plagues the Hellcat guys is that FCA Material Standard MS-12633. Apparently MS-12633 is FCA's own spec, not an industry spec. And apparently the PUP is the only oil that has been tested by or for FCA to meet that particular spec. We can all guess just why that is. All of the other oil specifications are readily available in several different oils from different manufacturers. Does your owner's manual list the same spec for your engine?


Engine Oil Selection
For best performance and maximum protection under all types of operating conditions, the manufacturer only recommends full synthetic engine oils that meet the American Petroleum Institute (API) categories of SN.

The manufacturer recommends the use of a full synthetic SAE 0W-40 engine oil or equivalent meeting the requirements of FCA Material Standard MS-12633.

Engine Oil Viscosity
Use Pennzoil Ultra Platinum 0W-40 engine or equivalent Mopar oil meeting the FCA Material Standard MS-12633 for use in all operating temperatures.

The engine oil filler cap also shows the recommended engine oil viscosity for your engine. For information on engine oil filler cap location, refer to “Engine Compartment” in this section for further information.

Synthetic Engine Oils
You may use synthetic engine oils provided the recommended oil quality requirements are met, and the recommended maintenance intervals for oil and filter changes are followed.

Synthetic engine oils which do not have both the engine oil certification mark and the correct SAE viscosity grade number should not be used.