15w40 with an api rating of cj4
15w40
The Cummins motor is not a "Dodge". Dodge does use the "b" series Cummins engine in its pick up trucks. Ford does use the Cummins in its F650 and larger trucks. NO, Ford never has used the Cummins Diesel as far as I know. Up until 2010 the Powerstroke was built by Navistar, formerly International Harvester. In 2010 Ford starting building the Powerstroke themselves but kept the name. Dodge uses the Cummins diesel and GM uses the Duramax which was designed jointly with isuzu.
No, Dodge just has a contract to use the Cummins engine.
15w40
Dodge V8 uses 10W30. Cummins diesel uses 15W40.
5w20
Any good quality 15W40 Valvoline true-blue 15w-40
Yes
5w20
No, they just have a contract to use there engines.
Dodge does not use inertia/reset switches.
You can use synthetic or conventional.