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CI4 & CI4+ oil is still alive and well

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1989-1990 Cummins LTA10 engine oil spec

Anti Gel

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I used my last gallon jug of Delo 400 CI+ in the oil change of November, 2020. I only had the one gallon left so (oh, horrors), I mixed it with 1-3/4 gallons of Costco's synthetic 15W-40.
 
I used my last gallon jug of Delo 400 CI+ in the oil change of November, 2020. I only had the one gallon left so (oh, horrors), I mixed it with 1-3/4 gallons of Costco's synthetic 15W-40.

The new Delo 400 CK oil is leaps and bounds above the CI oil, so I wouldn’t be shy about running it at all.
 
My Son is running the AMZ/OIL AME 15/40 Diesel & Marine with their filter made by Donaldson. He runs 22-24k changes with approval from Blackstone. His truck is a 15 HO and deleted.
 
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