It say on the can
"When added to crankcase (oil) Helps:
Quiet noisy lifters and clean dirty parts due to deposit build-up.
One pint treats 10 quarts of oil (use 1½ oz,per qt) For use in all motor oils including synthetic. Can be used before or after oil change. When oil becomes dirty , change oil."
borrowed too much money this week lol. Got to take the risk lol :/