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Old 11-30-2019, 03:18 PM
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Oil Overfilled?

I just completed an oil change on my Ď14 Jk. Drained and filled with 6 quarts of fresh oil. Problem is when I went to put the old oil back in the oil container only made it to 4 quarts. I have no signs of an oil leak. Removed the oil filter first before draining to break the vacuum seal. Tried to check level on the dipstick and hard to tell if overfilled but appears to be at the max level of the measurement. Thoughts? Next steps?


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Old 11-30-2019, 04:10 PM   #2
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If you removed the drain plug and let it empty then you have nothing to worry about in terms of overfill. The capacity of the system is 6 quarts and there is nowhere for it to be but in the bottom of the pan.

If you only got 4 quarts out then you were previously under filled, have a leak or burn oil.

Run it with 6 quarts and check it regularly to ensure it’s not leaking or burning off.

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Old 11-30-2019, 04:20 PM   #3
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I just did mine, drained 5 qts, filled 5 qts =level 3/4 full.
It looks to me that when is cold it retains ~ 1/2qt of oil. Maybe more.
Wll warm it up next time.
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Old 11-30-2019, 05:43 PM   #4
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I just did my '15. 6 qts. The manual says six and I always put in six. The dip stick says full but not over filled.
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Old 11-30-2019, 05:48 PM   #5
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My 2014 uses 6 quarts, and measures exactly at full when I'm done. If you only got 4 quarts then I'm betting whoever did it last didn't fill it completely.
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Old 11-30-2019, 07:01 PM   #6
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Maybe the person that did the last oil change only put 4 qts in the engine hoping to reduce your carbon footprint.
Afterall, you do live in California. :-)
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Old 11-30-2019, 07:45 PM   #7
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I always run my engine for a couple of minutes 2-3, to get the oil a little warm and viscous.

Drain, refill, check levels.

I will say, the dipstick isn't the best at showing levels.

If you're worried, drain it and do it again.

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Old 11-30-2019, 08:37 PM   #8
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I checked again this morning and dipstick level is MAX with only 5 qts added.
Definitely needs to be warmed before oil changes.
I never filled more than 5.5 qts though. Tried 6 qts one time and it was overfilled.
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Old 12-01-2019, 04:31 AM   #9
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Quote:
Originally Posted by Lemotan View Post
I checked again this morning and dipstick level is MAX with only 5 qts added.
Definitely needs to be warmed before oil changes.
I never filled more than 5.5 qts though. Tried 6 qts one time and it was overfilled.
I'd drop the pan and check it for a quart of sludge in the bottom then. Something isn't right if you don't have a dented pan.
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Old 12-01-2019, 05:04 AM   #10
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My 2016 JK Rubicon takes exactly 6 quarts. Checking the oil level prior to an oil change is a good idea, this way you'll know if the level was low or not before dumping the oil. If only 4 quarts came out there are only a few possibilities, the oil was low from the last time it was changed, the oil leaked out, it was consumed, or it wasn't drained long enough. If that were the case, then in this example the OP would be overfilled by 2 quarts, if the sump was full to begin with and he dumped in 6 qts. That's why checking the oil level before draining the oil is a good idea.

Having said that check the oil frequently to see if it is consuming oil and look for a leak, especially in the valley where the oil filter cooler assembly resides, the backs of the valve covers, the timing chain covers, and where the engine and bell housing meet.
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Old 12-01-2019, 05:41 AM   #11
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I'd drop the pan and check it for a quart of sludge in the bottom then. Something isn't right if you don't have a dented pan.
18K miles and 5th oil change, I probably didnt drain it properly.
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Old 12-01-2019, 07:01 AM   #12
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Tried to check level on the dipstick and hard to tell if overfilled but appears to be at the max level of the measurement.
Did you start the engine first to let the new oil circulate throughout the system and then turn it off and let it settle down for several minutes before you checked the level? You will get an inaccurate reading if you simply filled it and immediately checked the level right after that.
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Old 12-01-2019, 07:11 AM
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OP. here. Thanks you all for all of your posts. To answer a few questions. I did let the engine warm for about 5 minutes prior to pulling the plug. Let it sit for a few minutes also. I did the last oil change myself and definitely put in 6 quarts. Last time I did not measure what came out. I think a good best practice will definitely to check the oil level both more regularly and prior to the change.

Iíll do a more thorough inspection to check for leaks today and see what I find

Last, I have an aftermarket winch and bumper that obviously adds a bit of weight. Would slight nose down impact the drain process? I thought my garage floor was level but Iíll check that too.



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Old 12-01-2019, 09:26 AM   #14
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I have my front wheels on plastic ramps when I change the oil, so I've got a good slope to the drain plug going on. I also run the engine just a bit before I get started so the oil is warm and flows well. It drains well and I get six quarts in it.
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Old 12-02-2019, 05:00 AM   #15
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Quote:
Originally Posted by gravitywell View Post
I always run my engine for a couple of minutes 2-3, to get the oil a little warm and viscous.

Drain, refill, check levels.

I will say, the dipstick isn't the best at showing levels.

If you're worried, drain it and do it again.

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bah. i run mine till the dash says 2% remaining. at that point, it runs out like water and doesn't stick to nothing.
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Old 12-02-2019, 05:46 AM   #16
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OP. here. Thanks you all for all of your posts. To answer a few questions. I did let the engine warm for about 5 minutes prior to pulling the plug. Let it sit for a few minutes also. I did the last oil change myself and definitely put in 6 quarts. Last time I did not measure what came out. I think a good best practice will definitely to check the oil level both more regularly and prior to the change.

Iíll do a more thorough inspection to check for leaks today and see what I find

Last, I have an aftermarket winch and bumper that obviously adds a bit of weight. Would slight nose down impact the drain process? I thought my garage floor was level but Iíll check that too.

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Yes slight nose down could leave more oil behind than usual, that would pertain to vehicles with the drain plug at the rear of the pan. Two quarts more, I doubt it. Next time elevate the nose slightly, two pieces of 2x8, 2x10 or 2x12 laying flat should guarantee a better drain in your situation. Lay them flat under the front tires and drive up on them. Then secure the parking brake and chock the tires, the usual safety precautions.

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