quote:Interesting. The TBN for the Mobil-1 that's approaching 5,000 miles service in my wife's Sequoia is still at 6.9 (just tested, posted in the UOA section). I've seen in a number of different places that certain syn base stocks do have inherent detergency. For automotive applications, the diester bases, such as used in Neo, are the most aggressive cleaners. The POE (polyol esters, like used in RedLine) are supposed to be almost as good. PAO, while generally an excellent base material, is only mildly detergent, as compared to the esters. Group-IIIs and Dino oils are only as detergent as the additives put into them. Real Experts: did I get that pretty much right???
Originally posted by TC: Oil spec sheets confirm that, in general, synthetic oils have significantly higher TBNs than dino, and mixed fleet "diesel" lubes such as Rotella are significantly higher than syns. If you're primarily looking for cleaning capability, and not as concerned with syn performance, go with mixed fleet and save a few bucks. TBNs for three 10w-30 oils: Kendal GT-1: 6.2 Kendal GT-1 Syn: 7.9 (10.1 for 5w-40) Shell Rotella: 11.5
quote:Am I missing something here ? Isn't Auto RX concentrated Esters ? Or is it a different type of Esters ?
Originally posted by JohnBrowning: THe esters do not clean like a detergent. THe ester want to attach themselfs to the metal more then the sludge wants to attach to the metal.