Not Ranked
Bill S. (aka Mr. Mustang) has posted on this before and apparently used to be a dealer. You should be able to find his other posts with a search on cold fire. I'd never heard of it before but it sounds like the best solution - works great, non-toxic, non-corrosive to the car, being used in race cars...
As for cost, the only reason cost would really come into play is if you have to recharge the cylinder annually. Otherwise, it is a one time cost for a long period of time so shouldn't be an issue. Bill, if you read this, what's the recommendation on maintaining a cylinder?
Regards,
Kevin
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