Hi, I just found this great site a few days ago and this is my first post. I have to drive about 36,000 miles a year for work and I have a 2001 Toyota Corolla with 70,000 miles right now. The drive is probably 85% highway and currently I am using Mobil 1 5W-30 which I change at 6000 miles every 2 months. And I live in California so there is no snow. Are there any recommendations that I should do or change to keep my car in good shape (besides changing jobs ). Thanks in advance.