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Both are ridiculously overpriced. I got a gallon of red yesterday for $27 and change. At least it's full strength. Pink will cost the same and its already premixed. What a ripoff.
True that. IIRC, when I priced both over a year ago, the full strength red was actually less expensive than the pink, seems like the red was ~$18, pink ~$22. Afaik the Toyota pink is supposed to be long(er) life.
To the OP, if you're planning a flush with the pink (either Toyota or ZerexA), since it's premix how do you plan on getting a 50% cooling system concentration? Easy to do with full strength, without draining block tough to do with premix. As suggested, if you're going to use pink(premix), just do a rad. drain and refill, and do it more often than recommended maintenance schedule.
I'd say Zerex Asian would be safe to mix with Toyota red or pink. That said, I don't prefer/like premix.