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Old 01-24-2013, 02:54 PM   #32
Benesesso
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Joined: Jul 2008
Location: West of Phoenix, Arizona
Oddometer: 9,898
Keeping a heater core in good shape REQUIRES the use of enough anti-corrosion additives for protection. All "decent" antifreezes contain these, but the cheap green stuff's silicates don't last too long, ~2 years tops.

Run it at 50% and change it every 2 years and that's about all you can do. I'd avoid the orange stuff, it usually works but there's too many horror stories for me.

For my "good" engines I use the $26/gal Toyota red antifreeze (has lots of corrosion-fighting phosphates that last many years--no silicates), but you MUST use only distilled/very soft water with it.
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