I've heard in the past from a toyota tech friend that the 3.5 has gone over many updates since it was produced around 2004. Only internal engine upgrade I've heard is the pistons had a couple more compression holes around 2018 for the 3.5 engines. I guess it allows less chances for the oil...
We still have roughly 3'' of hard icy snow here. Doesn't look like it's going to warmup anytime soon. Were suppose to get another inch of snow tonight.
Been nippy again today....ran a couple errands this morning around 9:30, truck temp dash reading never got above 8 degrees. Still cold as I post this at 3:15 pm....at least it's 19 degrees now, and cloudy.