The saturn forums recommend a piston soak, generally to unstick oil control rings to less oil useage. Warm up the engine to operating temp, this will fully expand piston/rings and get a good seal. Next remove plugs and crank engine in shart bursts until piston midway up/down. Use enough of solvent to cover piston about 1 inch deep, 3~oz. per cylinder depending on size. If rings in good shape,little will flow by to crankcase. Even on deep heads you should be able to see fluid level in cylinder. Check every 1-2 hours and see if it has dropped, top up to keep it wet. Let it soak as long as you can before you remove any left over in cylinder. You can do a fairly good job with a turkey baster and length of small hose. I could pour in 4oz. and suck back out over 3. You will likely want to change oil after this.