Zinc

This is what I wanted. Food for thought. Not everything you read online is true. "I'm a French model! Wewe!" I agree Madscientist. I'll take all the oil pressure my filter will take. I'm not worried about 5 hp as much as longevity. Chevy's are known for lower pressures like I had. I've seen a lot of them not live long too. I still believe very strongly that flat tappets need zinc but probably not as much as you think. I was looking for something I could find local for a fair price and that's one of the factors that put me on Vr1. 20 50w Brad penn is probably fine but I have to order it online and it's about $9 a quart, which I would gladly pay if I thought it was better. But I don't it's that great. Criscbath, A lot of my friends use Vr1, rotella, or pennsoil. I had a good break with Brad penn and I have about 1000 miles on the engine. Do a little research and I'm sure you'll figure it out. I'm not big on additives. I've never used them except for Lucas.