I feel your pain. I have 2 cars that use the red and 2 that use the pink. Pink is not merely a diluted red. Pink has Sebacic Acid and Potassium Hydroxide while the Red uses Organic Acid Salts and Hydrated Inorganic Salts. It's the sebacic acid that puts the super in pink.
Toyota says in a TSB that the Red and Pink are compatible. Honestly, I can't say for sure what that means. Does that mean you can use the Pink in a 2000 4Runner? Does that mean you can mix the two together and they won't gel or cause some crazy chemical reaction? Can I use the Red in a 2010 4Runner?
If your cooling system contains copper, brass or lead (older Toyotas) you would get your maximum corrosion protection with the red. If your cooling system is all aluminum, you should get the best bang for your buck with the pink.
Lots of people say they swap coolant and everything works fine. You could use straight water and everything would work fine and your car would actually run cooler. Cooling system damage occurs down the road. Once the corroded aluminum oxide starts flaking off and sandblasting the heater core til it goes bad at 100k and it costs $800 to replace we may have wished we used the correct coolant. My brother says this coolant thing is all a bunch of crap and uses Green in everything and adds tap water to boot.
I ain't saying there are no other coolants for Toyota other than Toyota. There are some good coolants other than Toyota. I just ain't gonna use them.
There are many different opinions on the "red vs pink." The truth is they are not the same. And the truth is any problem is gonna show up way down the line. And we will be led to believe the repair was simply due to the age of the vehicle.
If you continue to use the red, please premix before you add. I use a gallon milk jug with markings at each quart.
Be sure you change based on time/mileage with the emphasis on the time side. You can get some pH sticks to help monitor the life of the coolant.
I decided to just use both the red and the pink. I have 2 gallons on hand.
This is a pretty interesting read on coolants https://www.motor.com/magazine-summ...easy-being-green-or-yellow-or-orange-or/