Oil Overfill Concern After Recent Oil Change – Seeking Advice

[Buldawg76]

The car was on a level surface (it’s a manual, and it was in neutral). I checked the oil level after driving the car and letting it sit for 1h30m. The cylinder head temperature was around 140°F at that time.

I have a 2015 Mustang GT, which has an oil capacity of 7.6 quarts. I brought two jugs of oil, each containing 5 liters. After the oil change, there was slightly more than 2 liters (about 2 quarts) left in one of the jugs, plus the oil still inside the engine.

So, it appears the overfill is closer to 1 quart in total.

If you want to get down to the nitty gritty then 7.6 quarts equals exactly 7.19 liters so why don't you just put 7 liters in the engine and call it good and you should then have 3 liters left over from one 5 liter jug.

You're making a mountain out of a molehill.

BD

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[Nick034]

If you want to get down to the nitty gritty then 7.6 quarts equals exactly 7.19 liters so why don't you just put 7 liters in the engine and call it good and you should then have 3 liters left over from one 5 liter jug.

You're making a mountain out of a molehill.

BD

I’m not sure at what level of oil overfill the crankshaft starts colliding with the oil, and that’s my main concern. Theoretically, being 0.5 quart overfilled shouldn’t be an issue, but honestly, I don’t want to find out the hard way. Additionally, the car is often driven on hilly roads, which means the oil level is frequently at an angle.

 

[Buldawg76]

I’m not sure at what level of oil overfill the crankshaft starts colliding with the oil, and that’s my main concern. Theoretically, being 0.5 quart overfilled shouldn’t be an issue, but honestly, I don’t want to find out the hard way. Additionally, the car is often driven on hilly roads, which means the oil level is frequently at an angle.

1/2 quart or 1/3 liter is not enough oil overfill to make any difference at all in any driving situation you would normally encounter on the roads. My ecoboost take 5.7 quarts with filter change and I always put in 6 full quarts and call it good with never having an issue. Just realize you will never get the exact same volume of oil out of the engine at every oil change so there will always be some slight variation on level showing on the dipstick from one change to the next.

Drive it and enjoy your ride.

BD

 

[Skye]

I can't see any damage having occurred in the brief period of use since the oil change. But I do think it's a step towards goodness to get the level correct. The Engineers prescribed a level using the stick and reference markings.

I'd check the oil level using the method described below, which references waiting 15 minutes, then checking. If the level is found over, return the car and have them drain off a bit. It's a simple fix I'm sure they'd be open to accommodating. In that process, you'd also confirm how much the tech put in and how accurate the dipstick is vs. the recommended oil level.

Edit,

In the future, I'd make it easier on the tech: 1x5-liter jug and 3x1-liter bottles. I realize that's more expensive, but measuring things out just so from two large jugs is something of a PITA.

https://www.fordservicecontent.com/...-Owners-Manual-version-3_om_EN-US_03_2015.pdf

5.0L Engine: Engine oil 8.0 qt (7.6 L)

ENGINE OIL CHECK

1. Make sure that your vehicle is on level
ground.

2. Switch the engine off and wait 15
minutes for the oil to drain into the oil
pan.

3. Set the parking brake and ensure the
gearshift is in park (P).

4. Open the hood. Protect yourself from
engine heat.

5. Locate and carefully remove the engine
oil level dipstick.

6. Wipe the dipstick clean. Insert the
dipstick fully, then remove it again.

• If the oil level is between the lower
and upper holes, the oil level is
acceptable. DO NOT ADD OIL.

• If the oil level is below the lower
hole, add enough oil to raise the
level within the lower and upper
holes.

• Oil levels above the upper hole may
cause engine damage. Some oil
must be removed from the engine
by an authorized dealer.

7. Put the oil level dipstick back into the
oil dipstick tube and ensure it is fully
seated.

 

[K4fxd]

The things people stress about. The engine has a windage tray and 1/2 or even 1 qt is nothing to worry about.

Are you sure your dip stick is calibrated correctly? Did you ask the shop how many qts they put in the car?

 

[RMoeslein]

I would take it back and have them adjust the level. It is getting to be to common of a mistake,
That's why I have started to do my own again, tired of poor jobs and lack of caring by the guys doing the job

100% agree make them drain half a qt

 

[GregR]

I would not be concerned. If you are though, take it back, so it's documented if something does fail in the future. I am curious how you knew this " cylinder temp was 140 Fahrenheit when I was checking the oil level "

 

[Racer5973]

Hi,

I went to a reliable Mustang shop (they specialize in all kinds of work for Mustangs) for an oil change. They changed the oil, and I drove home. After a few hours, I checked the oil level and found it was overfilled (cylinder temp was 140 Fahrenheit when I was checking the oil level). I'm not sure by how much exactly, but I estimate it's around 0.5 quart.

So far, I’ve moderately driven about 50 miles and for about 2 hours with the overfilled oil. I know I need to drain the excess oil, but apart from that, do you have any other suggestions?

Also, what are your thoughts on the long-term engine reliability after this incident?

Not going to hurt anything.

 

[SheepDog]

Add 10 qts and call it good.

Gen 1-2 hold 8 quarts, not 10.

 

[Sean22]

A half a quart high? Who cares

drain a bit out in their parking lot and call it even

That wouldn't be very eco-friendly now would it?

 

[SL8888]

Maybe they forgot to change the oil filter ?

 

[Fred Luehrs]

Sounds like a win to me! That is a couple more W.O.T pulls for free. But seriously 10 quarts is 10 quarts.

 

[SCP440]

With such a slight over fill the only time there is any chance of the crank hitting the extra oil is on startup but as soon as the engine is running 60% of the oil is around the engine doing what it is supposed to do.
Leave it as it is and if your engine uses a little oil between services you wont need to top it up so soon.

 

[Keeffa]

That's nothing. There's so much oil in these engines the level changes that much depending on the temperature of the oil. I always fill mine a little over. It's right from cold but over when hot. It will have no effect to the engine.

 

[Goterr0r]

Geez, i hate to see the post when your car's air filter gets a little dirt on it. Your fine. You can sleep easy again tonight... Not going to hurt a thing. Maybe the tick will be quieter....

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