My Toyota dealer says with short trip city driving like my wife and I do, it is "severe service". They told us to change our oil and filter every 6 months or 5000 miles, whichever comes first. With all the different engine issues these days on the newer stuff, I actually think Toyota may be correct. I would, however switch to a brand name oil. At Walmart you can get the Mobil 1 products at good prices not a lot higher than the Super tech. The dollar amount spent on the oil change should not be the "main" factor in determining what products you use, though there is nothing wrong with trying to save a little money. Super Tech will work, are there better oils out there for not much more money? Absolutely. That is my opinion, wrong as it may be. At least you are concerned about doing the oil changes, that is a good thing. Mobil shows three oils for your car; I will put a link here.
https://www.mobil.com/en/lubricants...ndation/15635/101927/0-2024/Toyota/Highlander
https://www.mobil.com/en/lubricants...ndation/15635/101927/0-2024/Toyota/Highlander