The year, make, model and engine info would help.
added to much oil If you added too much oil that can and will cause engine wear and damage. If you are loosing Oil it is either being burnt, or it is leaking. If it is burning oil it is normally caused by worn piston rings.
On the outside? nota lot. it will heat up and probibly burn off in hot areas of your engine and cause a little smoking in your engin bay. but the rist will mosty drip off, how much oil was it?
Generally this is going to be an indicator or a fuel problem, as the engine is sending too much raw fuel to the cat to burn. First things to check would be spark plugs or wires. Running with a cat burning red hot for long can cause the cat to fail, and in worse senarios even burn through the floorboard.
if you press the pedal to much that is what can cause the engine to flood
Adding too much oil will cause your engine to burn off the excessive oil which causes a lot of carbon buildup in your engine and a lot of blue smoke out your tailpipe. If the oil level is high enough, it can contact the crankshaft and foam up. If the oil foams it can damage the engine.
you will blow out the seals and that is not good to much oil is just as bad as not enough the crank could also beat the oil to a froth and cause oil starvation to the engine the bearings could burn up pdq
Depending on the engine in a 172 they will burn from 6-10 gallons per hour
It should be OK if it isn't too much. The engine will probably burn it but it could poissibly cause the spark plug to foul and not fire; requiring one to remove it and clean it. It will not RUIN the engine.
It's just the complement to fuel displacement. How much air the engine takes in affects how much fuel it can burn.
Too much oil in your car will not cause it to throw a rod. Too much oil in the engine will create a higher than normal engine pressure and can cause the engine seals to fail.
the 02 sencers are in the pipe, if there is a problem with them it would cause the check engine light to come on but the pipes themselves wouldn't