I haven't posted in a while, but I since got rid of my 1999 Corolla oil burner and have a 2007 Toyota Highlander 2.4L, well with needing more money I drive for Uber about 30 hours a week as well as deliver pizzas 30 hours a week. I put on about 1,000 miles a week and the car uses 1/2 qt between 4500 mile oil changes with dino oil, havoline, peak, Pennzoil 5w30, Ive been using conventional purely for economics, but I'm wondering if using a synthetic oil maybe be better as its definitely severe service but I want what is the best value, all things included, OCI, gas mileage, maybe going to a 0w20 for better gas mileage. Or just stay with the on sale dino every 4500 miles and be fine with it?