Can’t speak to the Highlander but have a 2021 sienna with the same 2.5l hybrid drive system. Has been bulletproof and zero issues. It’s wife’s car and she loves it.
I do all the Maint as a Toyota dealer is over an hour away. Change oil every 5k and just did a 30k mile transmission flush. Has all the fluid diagnosed and everything looks great. We have had nothing but good luck with our Toyotas.
