Posting this up for a friend. '03 F250 7.3L with 122k miles. Truck is used in his Landscaping Business with short trips and towing(3-5k lbs) 75% of the time. All the UOA's have been with Schaeffer's 9000 5W-40. Its surprising to see how all the metals dropped this OCI, he hasnt changed anything. Running/Towing the truck the same with Diesel-Kleen every few tanks. Might be towing less due to the cooler weather though. Switching to Rotella 15W-40, the Schaeffer's was getting a little expensive.
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