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Ok, this would explain then why the truck feels like it's lost some power when I try to climb the hills after a long drive. Even the small hills it struggles on. But what's weird is that I get no MIL/CEL light and the idiot dash gauge is sitting a little above half way. It's never pegged hot.When CHT gets to above 255degF computer will start cutting fuel injectors, i.e. every other one will be off, to lower the temp, engine would lose power.
So 1 and 3 would work then 2 and 4 alternating.
'ya got my head spinning on all the different types of coolant.The "green" was used for alot of years and pretty much the whole engine cooling system during that time was cast iron with copper radiators/heaters with rubber hoses and a few steel parts like water pump impellers and thermostats.
As manufacturers started using different metals, like aluminum, the chances for galvanic corrosion increased, but as long as coolant was changed every 2 years protection remained, except not every one does that, and on older engines that wasn't a big issue since metals were the same, with different metals it was a problem.
OAT was developed for longer term protection, 5 years, so problems would occur AFTER warranty period, my own opinion , if people didn't change coolant when required.
There are all kinds of tests done as to which is better, IAT, OAT, HOAT, ect......., and with which engine models, years and displacement.
I can't say which is better scientifically on paper, but others have done that so I don't need to
On vehicle less than 10 years old I tend to go with what manufacturer spec'd for that year and engine.
After that I figure I am going to get leaks, lol, and go with my more practical plan short term protection, not figuring I will get that 5 years at this point, lol.
Coolant 0 psi 4 psi 8 psi 12 psi 16 psi 20 psi 24 psi -------- ----- ----- ----- ------ ------- ------- ------- Water 212F 225F 233F 242F 252F 260F 265F 33% 220F 230F 240F 253F 260F 268F 273F 44% 224F 234F 245F 257F 265F 272F 279F 60% 231F 241F 253F 264F 273F 280F 285F 50% 226F 236F 248F 259F 267F 275F 280F