Well, I changed the oil and filter on the wife's Aztec today. Changed out the Havoline 5w-30 and put in the GC. It's the GC Gold, not the green. Impression right off the bat was good. Nothing near the start up clatter with the GC as I have had with Mobil 1 in the past. Seemed to quite down the valve train considerably. Got to hand it to Havoline that I changed out. That stuff came out looking very good.