Sort of on related topic, found it on a Saturn forum. Good idea, bad idea on our Jeep V6?
MMO Piston Soak
This DIY proceedure is cheap and may help a Saturn with stuck oil control piston rings to use less oil by freeing them up. You'll need:
1. 12oz or 20oz bottle of "Marvel Mystery Oil" available at Walmart (among other places)
2. A spark plug socket, and old towel and AT LEAST 8 hours where you won't need to drive the car.
Does not ALWAYS work but here goes.
1. Remove spark plugs from "cold" engine
2. Pour 1~2 oz Marvel Mystery Oil into each spark plug hole
3. Allow to remain in overnight (at least 8 hours)
4. In the morning, cover the plug holes loosely with a towel and turn over the engine for 3~ 5 seconds with the plugs OUT to purge any remaining liquid MMO.
5. Replace plugs and drive normally after pouring remaining MMO(if you have any left) into gas tank full of gas
NOTE: The car maybe somewhat difficult to start initially after treatment and will SMOKE like a chimney for the first few minutes or so after it does start. This is normal and will cause no damage. Adding an additional 12oz bottle of MMO to the CRANKCASE (even if you have to slightly overfill it) about 400 miles prior to the next 2 oil changes can be beneficial as well.
Video:
http://www.youtube.com/watch?v=jLPwL0FAQjw&feature=related
