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Are you sure it's your Dad that wants more power? J/K
Sounds like a nice rig. Have him check the fuel mileage while it is stock.
Could need a fuel filter if the power is down.
The full synthetic is the was to go. I just change my oil when the odometer rolls over 10K. He might first try 5K with an oil analysis and then go to 10K if the oil checks out fine.
Sorry, can't answer the other questions and I refuse to guess.
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1996 3500 auto-183K,On 02-07-10. K&N air.18.2 MPG.
My daily driver is an 04 explorer xls
96 Regal 3.8 165k 29.3 mpg. 4-sale
Wife's truck 07 Ridgeline.
Other diesels,1987 Ford 2810 about 845 hrs. 1.25 gph.
07 Kubota ZD326 ztr 0.70 gph.
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