Transmission and coolant fluid

What intervals you guys running on transmission and coolant changes? Seen 30-60k on trans and every 50k on coolant

 

ATF - every 50-70 K if flushing, or every 30-40 K for drain/refill. OEM recommendation is flush every 60K under ‘special operating conditions’. Towing, off-roading, etc… I did a flush the first time to flush out the OEM fluid; now I do drain/refill with Maxlife.

Coolant - every 50K after 100K. This is the book recommendation. Personally, I use universal long-life coolant and replace every 100K.

 

I've been every 30k for ATF (simple drain/fill). After the first drain, subsequent drains are mostly clean/bright red looking.

For coolant I just drain/fill 1 gallon every other year or so. Keeps the additives in it fresh and a lot less hassle than a full drain and then trying to burp the air out.

 

I just did my 1 gal. Replacement today. I don’t mess with those block drains either.

 

ATF-Never, not once in the 50 years I've been driving.
Coolant -I replaced the hoses and coolant in my Tacoma at 17 years and 240,000 miles.

Four vehicles on the driveway with 700,000 combined miles, no issues. None of the others are old enough to need the coolant replaced.

 

Coolant is 100,000 miles 10 years for the first time.

ATF is 60,000miles or 5 years.

 

After doing full 12 qt auto trans fluid replacements at the recommended 60k and 120k interval mark. I will be extending my next 12qt fluid swap to 200k (80k on the fluid) with a transmission pan drop/clean/filter replacement. At which point depending on how the fluid looks coming out then I might extend to 300k (100k OCI) or go back to 60k intervals.

Coolant, 5yrs 50k miles. any longer and you risk acidity levels rising and eating away the multi layer headgasket. TBH 3yrs 50k miles even with good long life coolant (Zerex red asian or oem) is more ideal... this is super cheap and easy insurance.

 

Curious if anyone here has switched to Zerex Asian instead of buying Toyota SLLC? Zerex appears to be at least half the price of OEM. I don't imagine there would be issues since coolant is coolant but curious anyway.