And we've all seen UOA's that have a hodge podge of good oil in it and the UOA came out with average wear. You can get all anal and verbose about it, when it comes right down to it, unless you are redlining it all the time, you will have ZERO issues. Our oils now a days are just that good. Yea, I know all about different additives fighting for space, but is there a reality in this world that those additives are mostly close,and they clearly don't wipe out the other affect. Unless you are at readline all the time it really is a moot point to worry about it. Now I would do it in a naturally aspirated car with mild beating on it, in my turbo car were I have my foot into the boost all the time, maybe. I did one fill go with 3.5 Qt 5-30 Amsoil SS and 1 Qt Redline 0-40 to get more moly into it during late break-in miles. Now, I keep one brands (0-40 Amsoil SS) oil so I do not have any issue if I blow my motor under warranty when I may need Amsoil to back me up. I have UOA backing be up too.