Well, since Es300 are the same thing as camry's, I don't think it'll hurt him to use autozone's stuff. I'm not sure what needs to be done for the 90k tune-up, but I would use mostly toyota parts and fluids. My tranny fluid is by toyota, and just about everything else. The only thing that I use on my car (sc400) that's not from toyota is the motor oil and filter. It's not always wise to go cheap. I use mobil 1 10w-30, and mobil 1 filter. Try
www.clublexus.com , they have alot of useful info there and I'm also a member of that site. If not all, most of his question can be answered there.