What are the hazards of driving around a vehicle that has "too much" oil in it?

What can this damage, if anything, or why is it not recommended?

Contact with the crankshaft will inject air bubbles (foam) into the oil, which will then be pumped throughout the engine and reduce lubrication.

I've always been told it can help blow a head gasket as well.

Ditto what coach said, air bubbles in the oil due to contact with the reciprocating assembly will reduce lubrication. It will also blow oil out the breathers and make a hell of a mess.
Stephen


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67 RS/SS 350 700R4
69 SS clone unfinished
72 454 Weekend Racer

Also too much oil like to blow out rear main seals!! and that is never any fun!!

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69 Camaro RS, 355ci, 72 gm casting heads,mild cam, Preformer rpm intake, edelbrock 600 carb, 350 turbo w/ shift kit 2500 stall, 10 bolt 2.73 any more questions ask

I can personally attest to a rear main seal blowing because of too much oil. Idiot drained the front transfer case on my old truck and put 5 qts in the motor.

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Rick Dorion
69 RS Conv,355,M20,4.10's