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#2594842 - 04/09/12 07:48 PM Effects of engine overfill
penz08 Offline


Registered: 03/03/12
Posts: 53
Loc: new brunswick canada
What are the symptoms of an overfilled engine? Is overfiled by one quart will make my engine feel slugih?

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#2594849 - 04/09/12 07:55 PM Re: Effects of engine overfill [Re: penz08]
dave1251 Offline


Registered: 07/15/05
Posts: 7331
Loc: Maricopa, AZ
You have some questions today don't you? One quart you probably will not notice a thing. If you over fill you sump too much you start to have a problem of your engine seals bursting off the engine because of too much pressure but I have never seen that I just read about it.
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#2594852 - 04/09/12 07:57 PM Re: Effects of engine overfill [Re: penz08]
dparm Online   content


Registered: 04/19/10
Posts: 12569
Loc: Chicago, IL
Depending on the design of the oil pan you could also get frothing as the crankshaft skims the top of the oil.
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#2594854 - 04/09/12 07:58 PM Re: Effects of engine overfill [Re: penz08]
Jeffy_D Offline


Registered: 01/27/12
Posts: 302
Loc: missouri
Sluggish performance would be the least of your worries. If its overfilled and contacts the piston rods, its will cause the oil to foam , and where theres air, theres no lubrication.

Every motor is different, I wouldnt risk it. Drain it or at least get a syphon pump.


Edited by Jeffy_D (04/09/12 07:59 PM)
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#2594855 - 04/09/12 07:59 PM Re: Effects of engine overfill [Re: dave1251]
penz08 Offline


Registered: 03/03/12
Posts: 53
Loc: new brunswick canada
Yes I do have a lot to ask! One time my engine was shaking so much, i had new plugs oe, i think the stupid mecanic overfilled by one quart, and i think its too much for a 1.6L.

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#2594860 - 04/09/12 08:01 PM Re: Effects of engine overfill [Re: penz08]
Corvette Owner Offline


Registered: 01/22/03
Posts: 1623
Loc: Waldorf, Maryland
It can cause aeration of oil, which can be bad. Pull dipstick after car is running and see if you see bubbles.

What percent is one quart of full oil change?
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#2594863 - 04/09/12 08:02 PM Re: Effects of engine overfill [Re: penz08]
A1BadPizzaGuy Offline


Registered: 02/06/12
Posts: 19
Loc: FL, United States
The worst thing I've actually seen is foaming the oil. But I've poured a quart of MMO on top of an already full sump, and when I drained the oil about 500 miles later, there was no foam.

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#2594867 - 04/09/12 08:04 PM Re: Effects of engine overfill [Re: Corvette Owner]
penz08 Offline


Registered: 03/03/12
Posts: 53
Loc: new brunswick canada
The max is 3.3L

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#2594872 - 04/09/12 08:05 PM Re: Effects of engine overfill [Re: penz08]
The Critic Offline


Registered: 08/30/04
Posts: 17839
Loc: Walnut Creek, CA
On a 2nd gen Prius, 1/4 qt will likely result in reduced fuel economy and oil pooled in the throttle body.

Larger amounts of overfill supposedly, according to a TSB, will result in a no-start.

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#2594874 - 04/09/12 08:06 PM Re: Effects of engine overfill [Re: penz08]
crazyoildude Offline


Registered: 07/23/08
Posts: 5593
Loc: new jersey
you will get lots of bubbles

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#2594877 - 04/09/12 08:09 PM Re: Effects of engine overfill [Re: penz08]
Lead Shoes Offline


Registered: 03/03/10
Posts: 2390
Loc: Mn
Originally Posted By: penz08
The max is 3.3L


I wouldn't worry, I've overfilled mine by a quart and just let it burn off with no ill effect or blown seals.
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#2594878 - 04/09/12 08:10 PM Re: Effects of engine overfill [Re: The Critic]
penz08 Offline


Registered: 03/03/12
Posts: 53
Loc: new brunswick canada
Originally Posted By: The Critic
On a 2nd gen Prius, 1/4 qt will likely result in reduced fuel economy and oil pooled in the throttle body.

Larger amounts of overfill supposedly, according to a TSB, will result in a no-start.
wow, is it that bad? My car got a 1.6L , economical on gas, is smaller engine are more sensitive to overfill?

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#2594883 - 04/09/12 08:13 PM Re: Effects of engine overfill [Re: penz08]
Lead Shoes Offline


Registered: 03/03/10
Posts: 2390
Loc: Mn
What car is this exactly?
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#2594896 - 04/09/12 08:22 PM Re: Effects of engine overfill [Re: penz08]
silverrat Offline


Registered: 01/09/09
Posts: 1249
Loc: Ontario
I know a place that opened one drain plug on a 996 and not the other one, and then poured 10 liters of oil in it. It was smoking and leaking from a seal.
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#2594901 - 04/09/12 08:26 PM Re: Effects of engine overfill [Re: penz08]
Gene K Offline


Registered: 01/25/03
Posts: 3161
Loc: Decatur AL USA
It depends on exact engine design. On the roadcourse 2.0L DOHC Neon routinely ran 1 Qt Low to reduce the number of spun bearings caused by aeration of oil that occurred when the crank contacted oil. On the other hand Corvette LS1's routinely ran 1 qt overfilled to reduce the chance of uncovering the pickup in High-G, High-RPM Sweepers.
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