If a motor is overfilled with oil, the crank can contact the oil in the sump and throw up an oil mist which is picked up by the pcv, ingested by the intake and burned by the motor gunking up valves and fouling plugs and smoking out the exhaust. It usually will cure itself when the oil level is returned to normal but it is not great for the motor. To be safe, I would evacuate all the oil from the sump after loosening the oil filter so the oil trapped by the housing will return back to the sump. Refill the motor with the proper amount of oil and sleep better.
This... In addition to running an engine with too much oil to the symptoms outlined above... Over filling can and will result in damage of valve seals, basically, all the seals because increased "over-fill" causes too high of operating oil pressure...
I had High-Blood pressure before I changed my diet. No doctor, from Cardiologist, to Endocrinologist, General Practioniers, etc could tell me what the problem was because I'm in shape... Nor did they really care to... They just wanted to put me on medication. Before I figured out the problem (which was ultimately my diet) and simply wanted to add Blood Thinners and Beta Blockers, Diuretics, and ACE inhibitors rather than deal with the real problem. So while under-the-care of these lazy idiots interim I would go and "Give-Blood" in order to reduce blood volume... I'd be good for a month or so afterward sdue to decreased overall blood volume allowed much lower and normal Blood Pressure. I'm still considered young, lift a lot a weights and am an outdoorsman and quite active; and should never have had these problems. It was ultimately corrected by a change in diet... a low carb one at that has remedied all BP problems now. The point of the BP Volume and/or real life Parable above is this: having too much fluid in your system whether biological or mechanical is a problem as it drastically increases "pressure" whether Blood, Hydraulics, or Oil... All of which if left untreated, purged, and checked will blow out pumps, veins, valve seals all the same.
That and the possibility that the idiot adding your oil to the fill/sump simply spilled some excess in/on your engine block/compartment and residue is cooking off... will cause headache's and bad smells in your cabin as well. Because afterall... if an idiot at the dealer doesn't know how much oil to add... can you really trust them not to spill oil too? I think not! Hope this helps...
