I have 215,000 mi on my 99 Corolla and 265,000 on my 97 Prizm. I change every 3,000 - 4,000 using Chevron Supreme 5w-30 available at Kragen (Schucks / Checker) for $0.49 / quart after rebate. Toyota filters at http://www.1sttoyotaparts.com/disclaimer.html for $3.90 each. I also drain & refill 3.5 quarts ATF at every oil change. Cheap & works for me. Neither engine uses any oil and they both run like new.