Attention: TDR Forum Junkies 
I know my truck is an older 6.7L Cummins but I did let my dealer do the first oil change. Why?
Due to the gorilla that installs the filters on the Cummins engine it is best to let the dealer do the first set of filters changes, (I did not know about the gorilla at the factory). I found about this on this forum where individual's complaining about this. Installing them so, tight that the filter was almost impossible to be removed on the first attempt. I just had dumb luck on this.
The dealer will use whatever oil they have at the lube rack, that meets the minimum factory specification for oil. Your owner's manual will specify an oil viscosity and a certain API rating that are to be meet when servicing the engine. Most but not all dealers buy oil in bulk from the lost price bidder that meets this requirement. If the oil filter is the Mopar filter, this could be the standard filter that Fleetguard manufactures only rebadge as a Mopar filter. Geno's Garage sells these for $15.25 each.
Another thing to watch for is overfilling of the engine by the lube rack attendant of engine oil. I had this experience every time I have had my truck service by the dealer. You need to remember that usually the lube rack attendant is usually the lowest paid employee just learning the trade. Plus, the time allowed for an oil change is too short for the Cummins engine to totally drain the oil from it. The attendant will allow so many minutes to drain, put the oil pan plug back in plus change out the filter and fill up with 3 gallons of oil. Job done and on to the next vehicle.
After my third time for an oil change at my dealer and being over filled all three times. I have done this myself ever since. I also use the improve oil filter material that is used in the better Fleetguard filter StrataPore filter which Geno's Garage sells for $14.95 each. This is an improved filter materail and a few cents cheaper than the MOPAR filter.
Just my $0.02 on oil changes.
Due to the gorilla that installs the filters on the Cummins engine it is best to let the dealer do the first set of filters changes, (I did not know about the gorilla at the factory). I found about this on this forum where individual's complaining about this. Installing them so, tight that the filter was almost impossible to be removed on the first attempt. I just had dumb luck on this.
The dealer will use whatever oil they have at the lube rack, that meets the minimum factory specification for oil. Your owner's manual will specify an oil viscosity and a certain API rating that are to be meet when servicing the engine. Most but not all dealers buy oil in bulk from the lost price bidder that meets this requirement. If the oil filter is the Mopar filter, this could be the standard filter that Fleetguard manufactures only rebadge as a Mopar filter. Geno's Garage sells these for $15.25 each.
Another thing to watch for is overfilling of the engine by the lube rack attendant of engine oil. I had this experience every time I have had my truck service by the dealer. You need to remember that usually the lube rack attendant is usually the lowest paid employee just learning the trade. Plus, the time allowed for an oil change is too short for the Cummins engine to totally drain the oil from it. The attendant will allow so many minutes to drain, put the oil pan plug back in plus change out the filter and fill up with 3 gallons of oil. Job done and on to the next vehicle.
After my third time for an oil change at my dealer and being over filled all three times. I have done this myself ever since. I also use the improve oil filter material that is used in the better Fleetguard filter StrataPore filter which Geno's Garage sells for $14.95 each. This is an improved filter materail and a few cents cheaper than the MOPAR filter.
Just my $0.02 on oil changes.
