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Discussion Starter #1
I went to buy Rotella T synthetic to use as my winter oil. When I read the container it's only a CH rating
. 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
 

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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.
 

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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
 

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Discussion Starter #4
Thanks for clarifying. I thought it ment it had to have both
.
 
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