Originally Posted by dercody
yeah, it's a bit over, I would suggest loosening your oil pan plug and draining a bit out. Usually overfilling isn't a good idea. Some of the techs would be better suited to tell you if there is any danger. I have always been told it could cause engine damage. too high an oil pressure and such
The main reasons not to overfill your engine oil is because of the following.
One, if the oil is filled too high to the point that it is contacting the crank/connecting rods this adds added friction/restriction to the rotating masses, no a good thing.
Two,the real concern is that because the crank/connecting rods are contacting the oil, it can often "whip" the oil into a froth, this will create inconsistent oil pressures and air in the oil, thus can cause major damage because of lack of lubrication. You may or may not see the same oil pressure reading on you oil pressure gauge when this is occurring so you will think you are fine when you are not, but there is now air in the system. The oil pressure will never increase when you over fill a sump either. Bottom line fill to dipstick operation levels and no higher, you won't have to worry if you do this.