Is a flush really needed in today’s trucks? My truck has a coolant filter that I replace at 100k by the manual. I have a 2014 Freightliner Cascadia.
If you use the red extended life coolant. That stuff is good for like 400,000 miles. Just don't mix with regular coolant. I see some guys just adding water. That a little crazy. If you want the engine to last a long time
Antifreeze never goes bad. The additives do dissipate over time. Using a filter w/ dca time release is supposed to replenish system while keeping it clean. I would still check dca levels though as the filter only releases additives as needed due to a thin metal corroding in filter before releasing additivesI As far as flushing goes it’s always a good idea. I think doing new hoses at least every 5 yrs at most and flushing and refilling with new antifreeze is worth it . The more you flush the longer radiator lasts.
He means the big steel tubes that connect with upper and lower hoses they rust out and can be replaced if so by SS tubes.