Expert: Skip Bollinger - 1/10/2010

Question
i left my car sitting for 6 months and when i started it it run fine for 3 miles and quit mech says piston rings are stuck to piston not sealing compression was low in two cylinders what cav i do to un stick them with out major engine repair

Answer
Terry,
  This question is out of my realm of expertise. I'm a Parts Specialist as stated in my Profile but I will attempt to give you my opinion for your consideration. I'm NOT a Tech.
  With this being said, here we go....
  I have been in this industry 36 years. I have worked in a Machine Shop, Repair Facility and finally landed in the Parts area. I cannot fathom that the rings are rusted to the pistons after 6 months. They are covered in oil! Have you gotten a second opinion? Rings stuck to the piston will NOT make the vehicle quit running unless the engine fouls the spark plugs dramatically.  
  You don't tell me what 2 cylinders have low compression. IF those cylinders are adjacent, it could be a blown head gasket.
  To answer your question... There is nothing made to "release rings" from the piston. Rings stuck to a piston is a Mechanical problem. The engine needs to be taken apart for repair. There are a few "shade tree" solutions. I will list them here: THIS IS WITH THE ENGINE OFF!!!!!!!!!
  You can pour "Coca Cola" down the throttle body and let it sit on top of the pistons and eventually get to the rings.
  You can spray "WD 40" down the throttle body and let it sit on top of the pistons and eventually get to the rings. A full can!!
  You can pour "Transmission Fluid" down the throttle body and let it sit on top of the pistons and eventually get to the rings.
  You can pour "Sea Foam" down the throttle body and let it sit on top of the pistons and eventually get to the rings.
  Once you do this, you need to, by hand, turn the engine over so the intake valves that were closed will become open and let the "Coke, WD40, transmission fluid and Sea FOAM" get into the cylinders.  
  Let it sit for 2 days so the "chemicals" can work. Change the oil before you start the car. You don't want some of these chemicals going through the oil system (read crankshaft bearings).
  I'm still HEAVY on getting a second opinion. I'm NOT a Tech!! Good luck..
Skip