Running 4runners to High Mileage - Maintenence

At 100k you’re due for a coolant change and spark plugs if they’re iridium (per the manual).

Use OEM for both.
 
One thing a lot of people forget about with 4WD vehicles that are primarily city cars is to shift into 4WD and drive a bit every month or two. The manual has an interval and number of miles figured. Remember to lock any differentials (yours should have the center and rear lock).

My wife had a 2008 4Runner that was always picky about going into 4WD and our mechanic told us it was because the previous owner of 130k miles probably never used the 4WD. Her dad drives it now and he never uses the 4WD and the last time I tried it wouldn't go into 4WD no matter what I tried.
We bought a new 2023 4Runner about a year and a half ago; owner's manual says put in 4WD and drive for 10 miles every month.
 
We bought a new 2023 4Runner about a year and a half ago; owner's manual says put in 4WD and drive for 10 miles every month.
A good habit is to run it in 4 high whenever you're on a gravel road. It's better for your tires and better for the road.
 
One I haven't seen mentioned. Clean your Mass Air Flow Sensor about once a year. Its a small sensor located on top of the air intake box. Get you a can of Mass Air Flow Sensor cleaner, which you can also use to clean the throttle body), remove the sensor, give it a spray, let it dry for a minute and reinstall.

at 100K, I'd go ahead and replace the PCV valve. Make sure to buy an OEM part, they are about $130. There are non oem parts available for $30 or so. They are a definite crap shoot that will throw some codes. The valve is located on the top of the engine, easy to find and access, 2 screws and 2 hoses. If your truck has a rough start after filling up with fuel, its most likely this valve malfunctioning.

You're going to also want to take a close look at your ball joints, tie rods, UCAs etc. Those are all probably 100k parts. They'll go longer, but you'll want to start paying attention to them. If you taking that thing offroad, I'd consider starting to replace them incrementally.

Eventually, your tire pressure sensors will start to go. They are annoyingly expensive, but with YouTube and a wire connector, you can bypass them so that you don't have to be annoyed by a dashboard warning light.

I have an 05 V8 4.7 with 276k on it.
 
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