Anybody ever use nitro methane oil as an additive????

I bought a gallon of lucas 70 weight racing oil at pep boys for $9.00 because
it was half price.
I have used nitromethane oil as an additive in my engines before because i got it real cheap.
They are always heavy weight oil 50w/60w/70w.
It's just a heavy weight oil with an additive package.
Sometimes stores will get it in and it never sells good, so they end up selling it at a discount price.