Yeah I caused my son grief with his Power Stroke diesel. Havoline's orange is Dexcool their red is the ethylene glycol. It's orange and green arguement.
Dexcool is a no no for the Power Stroke, cavitation or something. Live and learn no matter how old you are.
Thought Toyota use to use purple coolant, it cost about 4-5 times more than green????? Early 90's
I switched to Dexcool after two years in my 98 Duratech, Havoline's coolant engineer told me the only concern about switching was not having a totally flushed system, otherwise the refill time went back to one year. Same as the ethylene.
I have an old 89 Probe I switched over to Dexcool and now 3 years later it's still clean and PH tests show it's still
safe.
My original reason for switching was because the Dexcool's supposed to tranfers heat better than ethylene glycol. Don't remember the exact Mr. Wizard science (something similiar to adding "water-wetter") behind the process, but as I recall the Duratech's head design/coolant passage needed as much help as possible?
Also I have solar collectors on my house and after switching to Dexcool in my domestic hotwater system I noticed an increase in heat transfer rate. Anyhow my sorta semi-official test proved to me it worked.
Of course straight water transfers heat even more efficiently, HOWEVER that little 32 degree F change of state problem.
Paul
