I found a 5w-40 synthetic oil Farm and Fleet brand and it is ci-4 rated not the new cj-4. Now should I be worried about it being store brand and buy it or just suck it up and buy the Rotella t-6 like I always do. The price is 25 bucks for 2 gallons which is really cheap and figure my truck and excursion I could save a few bucks.