I have a '16 SR5 Premium with 85k miles. I'm looking to keep this one to at least 200k. I've done regular oil and filter changes, changed oil in the 3 gear cases at 50k along with brake pads and changed the brake fluid. It seems too early to change the spark plugs. Would it be wise to change trans fluid or coolant? If it was yours and you have no problems so far what would you do to stay ahead of any issues and try to give this one a long life.

We have a 2014 SR5 with 310K miles on it. I changed the spark plugs and transmission fluid at 120K/240K and soon will change it again. Using Valvoline Synthetic ATF. Differential and transfer case fluid are getting changed every 50K to 60K. Mobil Delvac Synthetic 75w90 in the transfer case, Mobile Synthetic 75w90 LS in the differentials. Engine oil every 10K and recently using Quaker State 0w20 synthetic with Toyota filters.

Recently had the needle bearing in the driver’s side of the front differential replaced with the bushing. That was precautionary due to the mileage on the truck. The oft complained groan is really due to lifts placing a side load on the needle bearing. It got new fluid while the mech was in there.

Also recently replaced inner and outer tie rods. Other than brakes, rotors, shocks, serp belt, and one air valve, that’s been pretty much the work done on this truck.

2014 SR5...bought new...some medium off roading, towing, a bunch of road trips...currently i have 150,000 miles on the clock


10K oil (just changed on Sunday, and will now go to an every 5K schedule)
75K fluid change on both Diffs
Spark Plugs swapped & Transmission fluid done at 100K
Transfer case & Coolant done at 107K
brake fluid, pads and a front caliper replacement done at 125K

Im coming up on the time to start this cycle all over again... My truck runs like-new...that's why i bought it.

I had the trans flush done at something like 140,000 miles.
The Toyota service rep said I was just short of getting a "No" because they won't do it on higher mile vehicles if it hadn't been done before.
Some say don't do a trans power flush, you'll stir up all sorts of debris/ metal and ruin it. Worked out for me fine but I was nervous.

I had the power steering fluid replaced, coolant, and a dragging caliper fixed and full brake job as well at that time, 140K miles.

Otherwise trouble free. About to hit 150,000 miles.

I need to get the fluid changed in the front and rear diffs and transfer case.

Oh and you can do it yourself or get made fun of like I did (on here) and pay to have your drive/ prop shaft zerks lubed. Many weren't lubed sufficiently from the factory.

I would probably do both transmission and coolant now, and then wait until 100k and do transmission again. I did 50k and 100k transmission fluid changes on my 2016 Trail used as a daily driver, weekend warrior, backwoods camping rig, and everything is still running smooth. Of course change all other fluids accordingly also. I don't own that particular 4runner anymore, as I sold it to a close friend, but he's still enjoying every minute of it without an issue. Just my 2 cents!

I wanted to change the trans fluid, diff fluids and transfer case fluid at 50K miles but I'm over so I may wait until 60K. But definitely keep on time of fluid changes through the life of the vehicle.

For the trans I will use the pump to "flush" out the old fluid, not go somewhere to have it flushed.

Absolutely change the transmission fluid now if you're planning on keeping 200k+ miles. At your mileage, a drain-and-fill w/o filter change is just fine.

Yep. do a couple or three within a couple of weeks, that will get most of the old fluid out and/or significantly diluted with new fluid. Also, suction your power steer reservoir dry every oil change and refill with Valvoline ATF. Change your coolant as was recommended and keep doing the other stuff mentioned.

Never thought of doing this with the power steering fluid. I am guessing this is to keep the power steering fluid continuously being diluted with newer fluid over time? Nice idea!

The answer to your question is Yes. I've been doing this for years. Have a large syringe dedicated and labeled "For PS Fluid Only" just to make sure I never use it on something incompatible with PS fluid.

Thank you for this post, really helpful