Originally Posted by HatchVX

im running castrol 5w-30 right now then i will switch to Mobil 1 syn 5w-30 later. I think im going to cut the filter open today and look at it today. Im still getting a CEL. I have to check it out and find out what it is. As soon as i turn the car off its clears. Im thinking it will deal with my O2 sensor.