I did google it, and can come up with no info thus is why I asked you to show me some info on how much shell etc has. read this article I found. http://www.equipmentworld.com/side-b...ci-4-plus-oil/ second paragraph "But in the testing and development of the 2007 on-highway engines, manufacturers also found that sulfur, ash and phosphorous from burned engine oil clogged up DPFs as well. So for the fourth time in as many years the engine manufacturers and oil industry worked up a new oil standard, CJ-4, with lower levels of ash, sulfur and phosphorous."
