if its only a bit high on the dip stick, say 3mm to 5mm you should be ok ..... if over fille dby 1/2L or more then yes damage could be done....severe damage!!!!
Escorts seem to get away with it. A girl at work here poured a big tub of oil in when her dipstick was a bit low. She was followed for the next few days by plumes of blue smoke and said it made a funny noise for a while. The car's still going.
As the pistons go up and down they will be slooshing around in a load of oil which doesn't compress very well so you risk blowing oil seals and also forcing oil past the piston rings which will coke up the head and probably damage the cat as well.
First, the crank journals can “wisk” your oil into oil-foam.
The oil pump would pump foam = loss of oil pressure.
Secondly; your breather system will suck up oil making a mess of everything on the intake side.
That’s the blue smoke you see, most likely.
If the oil level is so high that it reaches the underside of the pistons and creates “hydraulic pressure”, you would pop the front and rear crank seals out.
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