Discussion: Old car myths

"I saw the re-run on how to destroy an automobile engine tonight on Discovery channel. here are 2 more things I have heard old timers used to do for a quick tempoary roadside repair so they could either go to a garage or home so they could get the car fixed.
1. Pour rolled oats(oatmeal) into a radiator to stop it from leaking.
2. Add to the inner tube to help seal a nail punchure, It may work on tubless tires too.
What kills an engine real quick is when a head gasket blows and engine coolant gets mixed into the engine oil. The fluid acts as an abrasive and wipes out the main bearings. Also if you want to sabotage an engine without the sabotage being detected is pour 1 to 2 cups of cigar ash into the engine oil. Cigar ash is a fine abrasive and when used in an engine the ash acts like a lapping compound polishing every bearing and piston ring. when tests are done on the engine oil all the tests will show is carbon and particilate matter normally found in used engine oil."