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: Rotella T Synthetic only rated CH JohnnyO 09-28-2003, 08:58 PM I went to buy Rotella T synthetic to use as my winter oil. When I read the container it's only a CH ratinghttp://www.dieselplace.com/forum/smileys/Unhappy.gif. The 2003 Duramax should take a CI rated oil according to the manual. I didn't but it. I have to find a place that sells Delvac 1.Edited by: JohnnyO k1xv 09-28-2003, 09:32 PM My 2003 Manual says CH or CI. My understanding of CI is that it is more relevant in vehciles with EGR, but I am not sure about that. However, I am sure my manual says CH or CI. CS-Dmax 09-28-2003, 09:46 PM JohnnyO, Well, you got me thinking...so I went out to my truck and got the diesel supplement...Mine says either CI-4 or CH-4. Reference page 5-18 of the diesel supplement. BTW, mine is also an 03. John JohnnyO 10-04-2003, 08:42 PM Thanks for clarifying. I thought it ment it had to have bothhttp://www.dieselplace.com/forum/smileys/Embarrased.gif. | ||