Last post on Oct 06, 2003 at 4:07 PM
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#10 of 16 anythings possible
Oct 04, 2003 (9:51 am)
I would say that small amounts of overfill (1-2qts) will cause mainly oil leaks. It will come out orifaces that you never knew you had. If you go beyond a couple quarts over, now anythings possible. Those moving parts need some space to move. If they don't get it, they will make room.
#11 of 16 Are you guys sure about too much oil causing seal failures and leaks?
Oct 05, 2003 (9:08 am)
My experience has been that a small amount of overfill (<1/2 quart over) will not hurt anything. In fact, I have read of LS1 Camaro owners overfilling by 1 quart to increase their oil capacity.
It reaches a point though, where the oil reaches the height of the rotating crankshaft, and this whips the oil into a froth. Oil with lots of air in it does not lubricate well. The result can be the same kind of problems you wuold have running a car without oil...e.g. bearing failure, catastrophic damange.
I personally am not familar wtih leaks resulting from overfilling. Can anyone who has seen these first hand please give us any details. How much oil are we talking about?
#12 of 16 I've seen plenty of them first hand
Oct 05, 2003 (1:59 pm)
You go beyond the fill level and you open yourself to all kinds of things. Do you think the engineers just blew it and made the level too low.The pan has baffles that are designed around the normal oil level. When you go above that you create all kinds of splash and foaming that's not normal. If you want to increase your oil capacity, then you have to make the oil pan deeper. A half quart is probably not a big problem, but why? The engine is engineered to operate on a specific amount of oil, why change that? Extreme heat or racing conditions, OK, enlarge the pan. Otherwise the factory knew what they were doing. Nothing good can come from overfilling.
#13 of 16 Increased oil sump capacity..................
Oct 05, 2003 (2:52 pm)
...is required when an engine can go from low RPM to very high RPM is such a short time that the oil in the oil pan is pumped out before the flow-back oil can return back to the pan. In some racing engine applications, its to ensure enough oil is covering the pump inlet on high-G turns.
For the vast majority stock automobile engines this will never be a problem. As someone has already indicated, the engineers who designed the engine probably knew what they were doing. Overfilling any engine beyond the recommended level could be perilous. It most certainly isn't going to provide any margin of protection for a factory engine driven on the street.
#14 of 16 re: A half quart is probably not a big problem, but why?
Oct 05, 2003 (6:05 pm)
I don't think this happens by plan, but oil change places are of course in a hurry to get the job done, and they do not take the time to let the oil drain out completely. Then they fill it to the capacity stated in the owner's manual. The result is a slight overfill.
I was visiting some people in FL and took my car to a quick change place. They gave it back to me somewhat above the full mark. I complained loudly and even called the owner, but they would not take the time to adjust it. Called the service manager at my GM dealership in PA, and he said...a little bit over is not going to hurt anything, so I just let it go.
I am now changing my own oil, so this is not a problem.
#15 of 16 re: A half quart is probably not a big problem, but why?
Oct 05, 2003 (6:57 pm)
Another reason why --> Some cars take fractional quarts of oil. For example, my Lumina takes 4.5 quarts. I have heard of people who will just use the entire container rather than keeping 1/2 quart on hand.
I am not recommmending such practice...just answering your question of "why?".
#16 of 16 Overfilled
Oct 06, 2003 (4:07 pm)
A half quart isn't going to kill you but it still isn't recommended to do intentionally. chris_horne was right. It happens because nobody ever looks for the EXACT capacity. They just fill till it looks full. Just lazy.