Quote:
Originally Posted by WildBillyT
They took it out of Rotella T? Damn, that was one of the only ones that still had a good level of zinc in it.
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They significantly deduced the zinc, phosporus and sulfur levels in all the diesel oils. Look on the back of the diesel oils and you'll see CJ4, that's the new oil with low levels of zinc. If you find CI+4 then you have the older diesel oils, although I think all of the CI+4 oils are no longer available. This was done in response to the EPA and emissions placed on the 2007 and newer diesel trucks. High levels of these compounds in the oil/fuel (all diesel fuel is now Ultra Low Sulfer Diesel, ULSD) will clog the particulate filters at an accelerated rate.
Back on topic, the stuff they took out of CI+4 diesel oil was the stuff that lubricates/cleans really well, especially in flat tappet applications. So the newer diesel oils don't offer the same lubrication packages as the older oils did. They may be better than currently available gasoline oils, in flat tappet applications though.