![]() ![]() Knowing your coolant is up to spec is important for the longevity of your 7.3 PSD. Otherwise 800 parts per million is the number to stay above. Too much SCA (above 2.0) starts to put stress on the water pump and anything below 1.2 per gallon can lead to conditions favorable to cavitation and pitting. It is good practice to test your coolant on a schedule, perhaps as often as every oil change or more frequently towards the end of its life cycle (every 1,000 miles) with 3-way Coolant Test Strips such as Fleetguard brand to check that the level of supplemental coolant additives (SCA) or nitrite levels in your coolant are in the optimum rage above 1.2 and below 2.0 per gallon, with a good target number being 1.5 per gallon. A pre-charged coolant does not require an initial dose of SCA but still requires the same 15,000 mile SCA supplementation as above.Īlthough not mentioned by Ford, we recommend routinely testing your coolant to ensure it is in spec. You may also choose a pre-charged conventional coolant, often pink or purple in color, if it meets ASTM D6210 standards. Whatever coolant you choose it needs to meet ASTM D4985 standards and will require the addition of Supplemental Coolant Additives (SCA) initially and then additional SCA supplementation at 15,000 miles or 600 hours of operation to ensure the coolant remains in spec. ![]() The OEM coolant is Ford / Motorcraft VC-5, but any high quality brand of diesel rated coolants will work if it meets or exceeds fords OEM specifications. The Ford Factory Recommended Standard on coolant calls for low silicate conventional coolant (Ethylene Glycol), often referred to as green coolant, with Supplemental Coolant Additives. For this we consider not only what Ford recommends but also what Navistar International, the engine manufacturer, recommends as well. Choosing the right coolant is important for all Diesel trucks and for your 7.3L Power Stroke Diesel choosing and maintaining the right coolant is necessary to ensure the longevity of your engine and cooling system components.
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