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Thanks for the help and info.

I have just baught the last known 3 gallons of Mobil 1 Truck and SUV 5w-40 oil. I have a 05 Dodge 3500 with a5.9 Cummins engine. My truck has 252,000 miles and I have used the TRuck'/SUV oil since the first oil change. The Mobil 1 Truck/SUV oil stocked now is 5W30 and does not have the CI-4...