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Message: [QUOTE="cRaZy8, post: 1551884, member: 21921"] I have been running Rotella 5w40 for at least 6 or 7 yrs in my truck. About 12k miles per year. 180k on the motor. Last 3 or 4yrs I also add 20oz of Archoil 9100 every oil change. I sample every oil change, typically 4k miles. Blackstone always gives me a good report, and often states I could go more mileage if I wanted. Only negatives they ever give is winter time oil changes, elevated fuel dilution from longer idling and warm up times. Have plenty of reports if you need em. [/QUOTE]

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