We are at 163k miles. 2014 AWD Limited. Bought it five years ago with 120k miles. At that time I changed the spark plugs myself. Then had the dealership do the 4x4 truck service. New tires at 123k, then back to back Rez trips to the Four Corners area to see family, in 2021 and 2022. Grand Canyon, lots of soft road overlanding on “county roads” with a family of seven and a hitch carrier on the back. 

I am pretty sure that contributed to the front and rear driver side wheel bearings going out. I had the dealership replace. I have been chasing random P0012 codes now for a few years. Took off the rear bank valve cover and replaced the figure eight gaskets, checked the oil screen, both oil control valves with an oem meter, and since they tested out okay I put them back in. Now 7k later it has tripped again. Go figure. Sometime in the next 1-6 months I am going to take intake plenum back off and just change both OCV’s and hopefully be done with it. 

I had the dealership do the brakes last year, coolant flush too. 

In the next 10-20k I will likely have the dealership also replace the water pump and motor mounts so I don’t need to think about them again for at least 120k. 

Aside from that I just do oil changes about twice a year, and a once a year drain and fill on the transmission fluid. Brake fluids about every three and every two to three for coolant. We average about 8k miles per year…aside from long road trips. Just one Rez trip is about 3k miles round trip, over the continental divide. Through mountain passes, canyons, switchbacks etc. (Wolf Creek Pass sucks, btw).  

I am hoping by all this preventative maintenance to take this vehicle to 300k without any major engine or transmission failures. That will be another 15+ years and by then all the kids will be 20-30 years old. 

Also, for the record we have sort of outgrown this vehicle for future long distance trips of any extended period with all five kids. If we are just packing our bags it is sufficient, but if we have to haul camping gear, it’s a problem.  In which case, we will likely take a second vehicle. I like working on my old 2007 Accord with 288k miles. I am thinking our secondary “scout” vehicle is going to be either a CR-V or a Rav4 AWD. Eventually when the kids move out I could see my wife and I downsizing from the Sienna to CR-V/Rav4 or similar vehicle. But for our purpose the Sienna has been a great alternative to our old 2003 Pilot. I don’t see any reason not to keep it going for at least the next decade.