Originally Posted by nicjak
Because bill you are blinded by a manual that is written for dummies. Heck the manual even states you can use a 30w if you like. As per the manual as long as it meets specs. Maybe you should get out of your box and actually trust those in the trade. i already said my dealer uses the same oil as i. Go figure i guess they are wrong also.
The whole premise behind any owner's manual is that it's basically written for dummies. It's a CYA thing for both the product manufacturer and consumer. From the consumer standpoint, if you deviate from what's recommended it's a pretty safe bet the manufacturer can/will use that against you if a warranty issue arises.
Looking at the MY14 owner's manual it states...
Engine Oil Viscosity - 3.6L and 5.7L Engines
MOPAR® SAE 5W-20 engine oil approved to Chrysler Material Standard MS-6395 such as Pennzoil®, Shell Helix® or equivalent is recommended for all operating temperatures. This engine oil improves low temperature starting and vehicle fuel economy.
FOR 3.6L NOTE: MOPAR® SAE 5W-30 engine oil approved to Chrysler Material Standard MS-6395 such as Pennzoil®, Shell Helix® or equivalent may be used when SAE 5W-20 engine oil meeting MS-6395 is not available.
FOR 5.7L NOTE: Vehicles equipped with a 5.7L engine must use SAE 5W-20 oil.
Failure to do so may result in improper operation of the Fuel Saver Technology. Refer to “Fuel Saver Technology – If Equipped” in “Starting and Operating” for further information.
Synthetic Engine Oils - 3.6L and 5.7L Engines
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.
Materials Added To Engine Oil - 3.6L and 5.7L Engines
The manufacturer strongly recommends against the addition of any additives (other than leak detection dyes) to the engine oil. Engine oil is an engineered product and its performance may be impaired by supplemental additives.
Edited to add...
It appears this is being driven in large part due to these being E85 flex fuel engines.
Selection Of Engine Oil For Flexible Fuel Vehicles (E-85) And Gasoline Vehicles
FFV vehicles operated on E-85 require specially formulated engine oils. These special requirements are included in MOPAR® engine oils, and in equivalent oils meeting Chrysler Specification MS-6395. The manufacturer only recommends engine oils that are API Certified and meet the requirements of Material Standard MS-6395. MS 6395 contains additional requirements, developed during extensive fleet testing, to provide additional protection to Chrysler Group LLC engines. Use MOPAR® or an equivalent oil meeting the specification MS-6395.