2 years is now up on my last coolant change which was last done due to a radiator replacement. I just assumed the car took the old "green" stuff. Now I'm not so sure. The fluid looks more lighter green or yellow like an AMAM universal coolant. It could be the Ford/Zerex G05 stuff. The last 2 coolant change invoices only listed "anti-freeze." Spent a couple hours last night just reading up on things. Best I can come up with is that Ford used green up through 2002....then G05 (HOAT) ever since.
I want to use the optimum fluid for this car. It's too bad I wasn't up to speed on what was used before. Whatever had been used seems to have done the job. Can't even be sure that the few flushes/drains were done with the same coolants (IAT, OAT, HOAT). For the past year I've been using Prestone AMAM Dexclone (OAT) for several cups of topping off....though completely unaware that this stuff wasn't just the old IAT/green stuff....and that "universal" now means DEXCOOL "lite." My Chevy has used GM DexCool since day 1...and has worked fine. At least those bottles said DEXCOOL right on them.
What to use now going forward?
I want to use the optimum fluid for this car. It's too bad I wasn't up to speed on what was used before. Whatever had been used seems to have done the job. Can't even be sure that the few flushes/drains were done with the same coolants (IAT, OAT, HOAT). For the past year I've been using Prestone AMAM Dexclone (OAT) for several cups of topping off....though completely unaware that this stuff wasn't just the old IAT/green stuff....and that "universal" now means DEXCOOL "lite." My Chevy has used GM DexCool since day 1...and has worked fine. At least those bottles said DEXCOOL right on them.
What to use now going forward?