I see in the manual I should use Toyota Super Long Life Coolant that is pre-mixed with 50/50 coolant and deionized water. I also see that a similar high quality ethylene glycol-based non-silicate, non-amine, non-nitrite and non-borate coolant with long-life hybrid organic acid technology can be used.
Should I purchase the toyota coolant or can I use Hyundai's ethylene glycol-based or Subaru glycol-based coolant I have for my other vehicles? My understanding is color doesn't matter, but FWIW, one is green and one is blue.

 

I really don't know, but if you have to go out and buy it, why not just get the Toyota coolant?

 

This has been covered quite a bit on CL. My answer is always, use the aftermarket coolant perform a long term experiment and get back to us. It is a certainty Toyota SLL coolant is stellar, we don't know that about the various aftermarket options.

I know for sure mixing some coolants with Toyota SSL can have a nasty chemical reaction.

 

I went ahead and ordered the Toyota coolant. For $30 bucks it seemed like a good idea for a vehicle valued around $30K.

 

"........My understanding is color doesn't matter, but FWIW, one is green and one is blue."

This is a correct statement. Unfortunately, there is no standard for coolant colors. You have to look closely at the chemical content and choose a product using that information.

 

In the book, at 100k it calls for Engine Coolant Change.

Is this a drain and fill, or a flush?

For those who have done either, what have you paid?

 

Don't remember what I paid, but definitely a drain-and-refill. IMO, a flush is too risky. Check the coolant condition and if it looks good, one D&R is fine. If it's very dark, I'd do two D&Rs about 3-4k miles apart.

 

Drain and fill. Easy DIY if you are handy and have the time. Two jugs of coolant and about one hour of time.

 

At my 50K service in FEB 2023, I had my Lexus dealer change out the coolant and brake fluid on my 2018 RX. Prices: coolant replacement $185, brake fluid replacement $162. FYI.

 

Those are pretty good prices for Lexus dealership! Nice find.

 

Just gonna put this here for anyone who is intersted. I'm gonna put this in my vehicle in a couple more thousand miles

AISIN ACT002 coolant

https://www.summitracing.com/parts/a...BoCLVQQAvD_BwE

https://www.napaonline.com/en/p/AICACT002

Rockauto also has it for like $13.xx

I think this is as close to.... no, I wold be pretty damn suprised if this wasnt the actual toyota/lexus pink coolant.

Even if it's not, it's probably as safe as it can get...