no issues. Add to cylinders, just enough to cover the piston surface. Be careful not to overfill for any piston full raised (it will leak into the exhaust system, don't ask how I know!). Let sit for a few days, use a turkey baster with a hose attached to get the fluid out. Be sure to crank the engine as well to get the rest of the fluid out- be sure to cover the spark plug holes with a rag, otherwise a big spraying mess (again, don't ask!).
Run compression checks as needed to verify if things are better? I'd change the oil due to contamination before starting the car.