Originally Posted by jkoebel

I was at Autozone the other day and saw a few cans of stuff to the effect of "Compression in a Bottle"
"Uses high-shear polymers to seal piston rings, reducing blow-by and increasing compression. For use in all gasoline and diesel engines."
My engine has some blow-by...the stuff is supposed to get added to engine oil at any time.
What do you guys think about them?