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« on: April 05, 2024, 08:07:08 pm »
Hank,
I have the same 2018 E450 chassis and 6.8L engine that you do on my 2019 2552, purchased new from Phoenix. I have never yet had to add coolant, and after 5+ years and roughly 15000 miles of service, my level (cold) is about 1" below that "Fill" indicator line you reference.
If the Ford manual you mention is the same one I have, (I bet it is), all the information you're seeking is in there under the "Capacities and Specifications" section. Be sure you look at the charts for the 6.8L 10-cylinder engine rather than the 6.2L 8-cylinder engine. The capacities (oil, coolant, etc.) are different although the specifications are the same. Ford recommends the same stuff for both engines.
The color of your coolant originally was orange--although Ford advises us in that same manual that "under normal operation the color can change to pinkish or light red". They also advise that the color change is normal and is no cause for replacement. The color of the coolant in my engine is pink now also. They strongly caution against mixing colors of antifreeze, or using the "one type fits all" kind.
I would advise using OEM coolant if you want to add some. The coolant specified by Ford is "Ford Motocraft Orange Pre-diluted Antifreeze Coolant, part number VC-3DIL-B". Specification number is WSS-M97B44-D2. This coolant is for all 6.8L 10-cylinder engines manufactured after 7/11/16. The coolant should be available at major parts houses, and certainly from Ford dealerships. A search of that Ford part number online returns a number of places to order it, including Amazon, if you'd rather not have to go to the store.
All the best, Mike