I just bought a case of 12 quarts of Royal Purple oil from RPMOIL company. THey sent me oil the only has the CI4 classification on the label. I have been using CI4PLUS Mobil delvac 15w40 as I thought the "PLUS" for for the newer EGR engines.
I checked with Royal Purple directly and they said the oil was made prior to June 2005 but it was fine to use since the 2004. 5 Cummins actually only requires the CI4 oil... .
What so you all think??? Use it or ship it back for a refund???
I checked with Royal Purple directly and they said the oil was made prior to June 2005 but it was fine to use since the 2004. 5 Cummins actually only requires the CI4 oil... .
What so you all think??? Use it or ship it back for a refund???