How often should I be changing the antifreeze in a Duramax with high engine hours. It does a lot of low speed heavy towing on dirt/gravel roads and idling. The truck in question is a 2016 LML with a little over 55k miles and about 4,000 engine hours. The manual lists 5 years/150k miles in both the regular and severe service sections.
If you look up the Ford Powerstroke recommendation for the 6.7L, they suggest 45k miles or 1,800 engine hours when operating under "special operating conditions" and checking the coolant additives every 15k miles/600 hours.
https://www.powerstrokediesel.com/docs/Coolant_Information.pdf
If you look up the Ford Powerstroke recommendation for the 6.7L, they suggest 45k miles or 1,800 engine hours when operating under "special operating conditions" and checking the coolant additives every 15k miles/600 hours.
https://www.powerstrokediesel.com/docs/Coolant_Information.pdf