O.K. I haven't read the code yet, but yesterday I just changed out my 01' Sebring to GC after an ARX clean and rinse. 37K on the car. Drove it for 70 miles, mostly highway, seemed fine. This morning, pulled out of the driveway, and the check engine light came on! Manual calls for 5-30 or 10-30 in higher temps. Ambient temp was 70F this morning. Could this be caused by too low a cold oil presure? Is the near 40wt too thick for this car? I'm dying here today until I can get home and have the code extracted.