I think most of the problems with using non-OEM coolants come from incompatibility issues when the old coolant is not fully flushed out of the system. Still, I probably would've used something else that comes in concentrate form, even if it's not OEM, because in my opinion, as long as the system is fully flushed with distilled water, most coolants available today will work just fine. Using distilled water first and then trying to flush it out using 50/50 mix is just a waste of perfectly good coolant, unless like in sayjac's case you have a different formula coolant in the system and you want to flush it out. It may not be a perfect system, but I'll know I'll have a good 50/50 mix (because the 50/50 mix is already in there and I'm only adding 50/50 mix) and it will still be cheaper than having a mechanic do it. So I'll have 88% new coolant and 12% old coolant. With three gallons, the drain and fill method can get me 88% of the old coolant out of the system. It is a concentrated formula made through carboxylate technology.
The Toyota Super Long Life Coolant is a concentrated and propylene glycol-based antifreeze. If I buy 3 gallons of Zerex Asian 50/50, that'll cost me $45. The Toyota Long Life Coolant is classic antifreeze based on propylene glycol with added corrosion inhibitors and some additives. I'll drain, refill with Zerex, run to mix it up, drain, refill with Zerex, runto mix it up, etc.
Well, that's why I plan on basically flushing with the Zerex Asian 50/50. That's the problem with premix, besides being half water it's really designed more for single radiator d&f's.
#ALTERNATIVE TO TOYOTA SUPER LONG LIFE COOLANT SERIES#
Or he can do the distilled flush series as I did but it will take longer and likely more new coolant loss. In the OP's case, he can follow his plan until the coolant reaches the proper concentration using the five ball AF tester. Then using an inexpensive five ball antifreeze hydrometer, continued the process until I got the proper concentration using the AF tester. I got all the green out with some distilled flushes, then started adding Type 2 to the radiator, ran it to mix, and did more d&f's. Or he can do what I did when the Honda stealer used original green coolant with a Civic head gasket job instead of Honda Type 2 premix. You can do several drain and fills just with distilled water, however from what I understand Zerex Asian can only be bought 50/50 pre-mixed, so you will not get a proper coolant/water mix ratio that way and you would have to buy fully concentrated coolant.
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