[blindingillusion]

This is horrible of me, but I run synthetic in my cobalt and I only change the oil when the car tells me to. I changed it every 3-5K at first, but with my new job I decided to let it go one time (which I am currently still doing) and see how long the car recommends between changes.

I must say though, when it comes to my 'maro then I will be changing the oil more frequently, and with better quality then I have before. I hear royal purple is good, and good things about mobil1.