Is it critical to change coolant at 100K?

[fj40dave]

Well.....

I thought the coolant was like the fuel filter: Good for the life of the car......boy, I've been running on borrowed time!

235k on the original coolant for my '08 HB.....no issues!

I did just order the Toyoya 00272-1LLAC-01 ANTIFREEZE GALLON W from the link above.....thank you RMcG!

[toyotavios_11]

150000km or 10 years whichever come first and subsequently every 50000km or 5 years whichever come first

[tmontague]

I'm doubtful there will be any objective evidence floating around.

I've been wrenching on old used cars for year - I buy them at their lowest price and put a lot of time into them so that I can be sure they are safe and comfortable for my family and last another 5 years at least. I end up with a great car fir pennies on the dollar.

One thing I've learned is what is useful and what is just wasting time and money. Coolant flush on proper oem fluid that appears fine is a waste. I have only flushed my yaris when I got it because it had green coolant in it.

I used to drop trans pans and swap out filters when I changed trans fluid. Every single time the filters were completely clear (all fine functioning trans, not blown apart). So now I just do a fluid "flush" using the trans cooler line. Saves me time and money on something that has shown no benefit.

In the end of the day it is your time and money so do what makes you sleep at night. But trust me when I say that a flush is a practice in futility in your case. This is coming from someone who is objective data driven and applies real world experience the best that I can to that. Ie: using 0w20 oil on the track amidst the cries of tradition