Never get your oil changed at one of those places! Do it yourself and spare yourself the headache from these idiots! Most the time they don't tighten the filter or the drain bolt!
A key dropped in the oil fill would never get up into the cylinders. All those pieces would be in the oil pan or oil passages. That key got into the engine some other way and would have had to go through the intake manifold, past the intake valves and then into the cylinders. They might have caused the engine death but your theory on how isn't sound.
I respectfully disagree. You are obviously not familiar with the 4.0L inline 6 cylinder Jeep motor. The cylinders are not “UP” from the oil fill. They are directly BELOW. And every piece of key easily fits by the valve stems. Thank you for your input, however incorrect it is.
@eddieg.jr.4044 if your theory was correct every time you poured oil into that engine it would have ended up in the cylinders, also the valves have valve stem seals to also prevent oil running down them and pooling on top of the valves. Really only 3 ways something can get in to a cylinder of a fully assembled had been running engine. Traveling through the intake tract, through the intake manifold, and past the intake valve while open. This would typically damage an intake valve while happening. Some how going against the flow of the exhaust tract. Or possibly through an open spark plug hole. Otherwise those cylinders are sealed off to the outside world. Remember the cylinders contain a small air gas explosion as the engine is running.Anything dropped into the oil fill hole would either stay up on top of the cylinder head near the springs, push rods and rocker arms or flow with the oil down into the oil pan.
@eddieg.jr.4044 I am to, hope you figure out how the key got in there. As those pieces are obviously the key but how they would end up in the cylinders is truly puzzling. One would think something like that, the key getting into the engine where it could get into the cylinders would make a bit of a racket before it did.
