Well, I changed the oil and filter on the wife's Aztec today. Changed out the Havoline 5w30 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.