GA; It's really a misnomer to call oils like Valvoline VR1 "Racing Oil"... What it is, in actuality, the "type" of oil we USE TO USE before EPA started making oil (aka: "High Zinc" as you have pictured)!! In short, most forms of what is now labeled "racing oil" simply has the correct "percentage" of "ZDDP" in it for pre-emission engines!! That is, the type of oil we used BEFORE zinc was "outlawed" by EPA for use in "modern" (emission) cars.. To rephrase, if your engine has a "flat-tappet cam", than you should use any oil containing Zinc.. If you have a "newer" "emission control engine (those factory built with "Roller Cams") you MUST use oil without "ZDDP", or any zinc additives!) The Zinc acts like a "shock absorber" between metal-to-metal parts in your engine!
Now, here is the real kicker.. An older (pre-emission) engine will live longer if a ZDDP oil is used.. AND one changes the oil every 2500/3000 miles (or every three months!).
Charles 1974 FJ40.