Cheap alternative to pricey flat tappet oil in street cars...

where did you get the idea that VR1 doesn't have enough detergent? They have a not for street use that is the same as the VR1 and is a race oil but the silver VR1 has plenty of detergent. I agree with the above post if your running stock type spring PSI you don't need much zinc, in fact when you get over 1,000ppm you run the risk of CAT problems the regular VR1 states not for cars running CAT converters.