Found some Warren 15w-40 Ci-4 oil at the local Agri-supply for 2.39 quart. They also sell the stuff in 5 gal buckets. Is Warren a good brand as compared to other big name brands such as Rotella?
How bout Coastal CJ4? Local AA has it for $6/gal. Seems like it could be a deal, or maybe it just barely meets the spec? Counter guy said a local company buys always buys a bunch from them and uses it in all their trucks and equipment.
Jugs say "World Class Lubricants" (Coastal Unilube).