I've been using Red Line 0w-30 for a long time with excellent UOA's. It's an American company and I buy it from a family owned and run business, Fallbrook Oil Company in Fallbrook, CA. They carry the whole Red Line inventory and offer good discounts. When I visit there the owner and his son and I solve all the world's problems until the next visit. It's more of a get together of old friends then just going shopping.