A lot of guys on the Impala SS list (94-96 list) hate dexcool.  The impalas have a problem with the heater core blocking up thus not throwing any heat.
 
For a long time everybody blamed it on Dexcool.
 
I think the final conclusion is that it is believed GM put a few clay tablets in the radiator at the factory just to be safe.  This brown clay crap is now believed to be the heater core clogging problem.
 
I flushed my Impala 2 years ago and replaced it with Dexcool again.  So far I have not had my heater core clog again.
 
I think what I am trying to say is Dexcool is probably ok.
 
BTW, what does ELC stand for?
 
Mark
 
 
 

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