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I`m a converted 7.3 Powerstroke Ford guy and one must add a conditioner to the antifreese coolant to stop pitting. Is this also required for the Cummings 5.9 24 valve diesel as well. Tx.

No need for additive just change the coolant every 30K miles... Now if you think you can extend this and get away with it I suggest you don't because as coolant ages it turn basic or acidic which at first will not change the color of the coolant but by the time you do see a change it too late.

So if you hold to the recommended 30K change schedule you block and radiator will look like mine in 5 years...

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That was a 1987-1994 7.3 IDI thing. The cylinder walls were too thin so they cavitated easily. I don't think it was an issue on the 1994-1997 or 1999-2003 "powerstroke" 7.3's. It isn't a bad idea to add some if you want but nothing bad is going to happen if you don't, the cummins doesn't have cavitation issues.

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