"The development of a new diesel engine oil category, currently called PC-12, is necessary due to advancements in engine technology and stricter emissions regulations that begin in 2027. As diesel engine technology evolves, they require oils that offer increased oxidation performance and wear reduction, can handle higher temperatures, and improve fuel economy."
https://rotella.shell.com/en_us/inf...me=L3NvcHVzL3JvdGVsbGEvbmV3c2xldHRlci9lbl91cw
https://rotella.shell.com/en_us/inf...me=L3NvcHVzL3JvdGVsbGEvbmV3c2xldHRlci9lbl91cw