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A 1994-2015 Ram 3500 uses R134a.
It depends on what type of RV you have. Some motor homes will take diesel, while some others take regular unleaded fuel.
10w30
Axles take 75w140 synthetic.
The newer differentials take a synthetic oil but I do not know which type
5w30
Red, 5 year, HOAT type
5w205w20
5w30 or 10w30
The same type you use in a current production diesel motor...
Any 15W40 diesel-rated oil is fine.
The 2015 Jaguar F-TYPE has double overhead cam (DOHC).