Torque converters may have been a problem around that era, thinking 2010's, and some of the the AWD have had problems with gaskets leaking on the transfer cases, if that's what it's called.
Disclaimer, I don't own a vehicle under 200k and new car smell to me is cigarette smoke or dog
If it were FWD and not rusted out, not burning oil...good maintenance history of regular oil changes, couple of transmission services(best it gets...) I might have a closer look.
Valve adjustment is what worries me, a shim or a lock-nut adjuster is preferred, but a lot of these Toyota you have to remove the cam shaft to replace a bucket type shim. One day I figure I will get a misfire code as one bucket shim no longer can perform it's service.