[DeTomaso] NPC - GM Dex-cool help needed

[JDeRyke at aol.com]

There's apparently an issue with mostly-aluminum engines. Honda and 
Caterpillar both found that "std" anti-freezes had been made for years with a high 
proportion of silica abrasives added to it. This was intended to scour iron blocks 
clean of hard water scale for better heat transfer. Some sort of detergent 
was also added to keep the particles in suspension. In aluminum engines, the 
scouring was sometimes too aggressive leading to internal wear that we often 
thought was 'erosion', and waterpump seal life was shortened- sometimes 
drastically. This led to 'non-abrasive' formulas and finally to the red-colored 
'long-life' anti-freezes for owners too busy or not smart enough to change the stuff 
yearly. I'm not sure what Dex-Cool's place is in this confusion.   I just use 
the std stuff and change it yearly; my mostly-aluminum cooling system has 
lasted just fine with our not-hard water. Good luck- J Deryke


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