
Originally Posted by
tuazon7
Got a response from Royal Purple Technical Manager for international markets. Will post it tomorrow, am on mobile now. Basically, what he is saying was that CJ-4 oils are okay for 500ppm diesel fuels (Euro II, which the Big 3 has) as the TBN is still within 20x of the sulfur content. That makes using Euro IV fuels (Unioil and Eastern) much much better. But since CI-4+ oils has a bit more of the anti-wear properties, it is still preferred to use this for additional engine protection. But for protecting both our engines and the environment, CJ-4 should be the choice...cheers