lifter trouble

We have run Valvoline racing oil for over 15 years and had no engine problems we could track back to oil. Used to run the regular Valvoline Racing oil but then they took the zinc out. Now we run the new Valvoline "not street legal" Racing oil which has the zinc back in it for bearing and cam and lifter protection. You are not supposed to run in a street vehicle. They say if your vehicle burns any oil, the zinc will ruin your O2 sensors and eventually your catalytic converter.
You can get from any NAPA Auto Parts at $3.79 per quart. Available as 10w30[part#850], 20w50[part#851] and straight 50w[part#852]. Also available in full synthetic. Make sure what you get says "not street legal".