Originally Posted by Englund
I used 4.5 gallons when changing the oil and filter. I have run the engine and checked and rechecked. Is this the same amount everyone else is requiring?
I just pulled the oil quantity off of the Cummins engine specifications online. I do, however, see the confusion. I thought the 12 quarts sounded like less oil than I had been previously told and looking back it, I think it probably was. It seems that Cummins used different size oil pans on the same engine, depending on how much room the vehicle it's in has. The 12 quarts is apparently for the Dodge trucks it is used in and the RV version seems to be the 18 quarts you mentioned. I just get mine serviced at Freightliner, so I couldn't swear either way. Sorry for any confusion I may have caused.