Originally Posted By: jldcol
Any SM rated oil should go 3k.Others compare Valv to Napa syn as same, perhaps same case with dino. Perhaps a tad lesser add pack, and valvoline is good 6-8k, so should work for the time wanted ok.
not to get off the orginal topic but what would be a decent interval for the napa synthetic oil?
5w30 currently in a 2000 F250 5.4 gasser with 148K (all it had before was castrol gtx and motorcraft 5w20 & 5w30 w/ the 3K intervals). just curious, im only going to put 5k on it so i think the oil should be in good shape.