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I recently purchased a very low mileage 2010 6.7L Dodge Cummins, 2500 4X4, with 3.73 gearing and 6-speed automatic transmission. I use this truck for basic transportation mostly, but occasionally for light towing. I love this truck. I live in Ontario Canada, which is not as cold as the Yukon or Fairbanks, but winter is coming and I am considering changing all of the various lubes used in the truck to synthetic. I am a fan of synthetic oil as I run it in my motorcycle, and all my other gasoline and diesel vehicles, both summer and winter. I’ve always liked the overall benefits of synthetic, such as better lubrication and easier cold weather starting. Now, I have noticed in the relatively short time with my “new” Cummins that my fuel economy (via onboard computer) improves by as much as 3-4 MPG as the engine warms up. I will be changing my engine oil to "Mobil 1, 5W-40 Full Synthetic”, and I also plan to change all the other fluids to synthetic as well; including my truck’s transmission ATF and the front and rear differential lube - for improved lubrication, better cold-weather performance and less viscosity drag when cold. Is this a good idea? I know there are arguments pro and con if the cost of synthetic in transmissions and differentials will really be recouped. I believe it will be both long-term financially and certainly cold-weather starting, performance and mileage. Do you recommend synthetic ATF for automatic transmissions and the front and rear differential lubes?

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March 2020