Oh hum. This one could go for a while. All antifreeze is not created equal. If you want to have a mess just mix a low silicate antifreeze with a high silicate. First you get a jello like crap in you cooling system then the silicates start to precipitate out and collect on radiator tubes as a hard scale. Next you get to replace your radiator AND your heater core too. Use a low silicate antfreeze. Use a low silicate diesel antifreeze designed for the trucking industry and you will never have a problem. NEVER MIX.

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Mark
82 300SD 110k
91 Caprice SS
92 Jetta TD
97 Cadillac Concours(300hp)
84 Celebrity 4.3L diesel