PEAK OET Extended Life Red/Pink 50/50 Prediluted Antifreeze/Coolant for Asian Vehicles, 1 Gal.

great

Good quality coolant

Excelent

Great coolant for flushing Toyota cooling systems.Must be mixed 50/50 with distilled water.

it has been a few weeks and car is staying cool/ correct temp, i would recommend to get to for most coolant replacement as they are a 50/50 mix

It's coolant.

0. Bought 4 gallons of distilled water at big box store for $5.Not purified water, not deionized water. Distilled water.1. Removed coolant overflow tank and drained and rinsed it clean.(remove fan electrical connector and fan shroud (two bolts)Cleaned hoses and sprayed with compressed air.Reinstalled overflow and cap and hoses.Reinstall the fan and shroud.2. Could not find the engine block coolant drain on a 2004 Corolla that is said to exist.3. Drained 7.7 qt cooling system with the radiator petcock (only about 3.5 qts come out).4. Filled radiator with distilled water and ran 20 minutes with heater on (full heat on temp dial, lowest setting on fan) and waited until thermostat opened, for 5-10 minutes with water circulating.You can see the water moving with the cap off, or check the temperature gauge.5. Drained radiator.6. repeat steps 4-5 two more times. (fill with water and drain 3 times)7. After the 3rd flush and drain I managed to get 85% of the 100% concentrated coolant into the radiator with the remaining ~3-3.5qts of distilled water making the required 50/50 mix. Leave the overflow tank empty for now.8. Drove car a day and then put another ~8 ounces of 100% concentrate into radiator fill after system stabilized.9. Mix the remaining concentrate (~16oz) 50/50 with distilled water in an empty clean bottle for topping off the radiatoroverflow tank to the hot full level after 20-50 miles of full temperature driving.Trying to flush and fill with 50/50 premix would be very expensive since you'd be using expensive ($18-$22 a gallon) premixfor the flush fluid. That's why I did it the way I did.Maybe if you could drain the entire 6.9 qts from the system each time this might work, but I never got more than 3-3.5 qtsout each drain. The multiple flushing procedures clean more old antifreeze and impurities out too.None of this is hard but budget 2-3 hours of time to do all this....Good luck.Don't believe the nonsense one commenter said about Toyota not accepting doing this yourself.That's complete nonsense. That's like saying BP gas isn't allowed but Mobil gas is.Antifreeze that is the proper type POAT, OAT, HOAT, etc. and conforms to the coolant type number is just as good as OEM,same for transmission fluid and oil. Toyota doesn't make any of these fluids they spec them and farm them out torespected manufacturers.If a Toyota dealer drained your radiator as one commenter said, it was probably the wrong antifreeze formulation for your yearand model. (green instead of red, or pink, whatever your year requires, etc....)4-30-25FYI This exact item was $21.99 from local Autozone last week.Had to replace water pump and my perfect drain & flush described here had to be drained by about 3 quarts installing new Aisin water pump. Made a 50/50 mix with distilled water and now have 2-2.5 qts of concentrate for the nexttime I need to crack the cooling system.. Don't try to reuse coolant that dripped down the side of the dusty engine or thru the underbody facia, it's not worth introducing impurities into the system. That's why the first coolant last 20+ years, it was never opened for any repairs.

Its cheaper to buy the concentrate and mix it with some locally bought distilled water. Be sure to properly recycle your old coolant too.