I'd like to thank everyone for being here and helpful. I've learned a lot and now have a good question... I did the Auto-RX on my '93 Honda with 140K, ran smoother and cooler...afterwards for 1500K, I used Mobil Super1500 15w-40...plenty of pickup...then I switched to Schaeffer's 15w-40, and gee, that nice green stuff was "very, very thin". The "pickup" is now gone, and there is a bit more drivetrain noise I really don't want a straight dino...I've learned that blends and syns are the way to go in the long run...Anyways, does anyone know if the Mobil 1 15w-50 will give me back the "seat in the pants" boost? Thanks in Advance!