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  1. Fluids Discussion
    I am changing the glow plugs in my '95 E-350 7.3L. In order to get to them I find it necessary to pull the radiator (darn vans!). Anyway, I've read in much older threads about the DCA-4 Coolant Additive. What is this additive and why is it considered necessary. Also, this is a retired short...
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