[jbandl]

My 2017 OB 2.5 has no issues at 6,000 miles.
(right strut was replaced due to chronic squeak)
Dealer changed the oil and it's 1/2" too high, at 2 hours rest and overnight.

At section 11-13 of the manual:
"To prevent overfilling the engine oil, do not add any
additional oil above the full level when the engine is cold."

So mine is overfilled; I might guess the consequence is foaming.
How important is it for me to drain off the excess ?
And is overfilling a policy to cover for any premature oil loss ?
(delivered 1/4" overfilled, maybe 1/8" drop in 6,000 miles)

 

[1 Lucky Texan]

if you drain into clean contaner(s), you can plug back up and refill minus the xtra.

I haven't seen the FB engine dipsticks so, I can't ay how severely overfilled it may be. I doubt there'd be any foaming at 1/2qt over..... or maybe a little more

 

[jbandl]

How much is too much engine oil ?

My 2017 OB 2.5 has no issues at 6,000 miles.
Dealer changed the oil and it's 1/2" too high,
checked at 2 hours rest and overnight.

At section 11-13 of the manual:
"To prevent overfilling the engine oil, do not add any
additional oil above the full level when the engine is cold."

The manual indicates I should drain the excess.
How important is it for me to stay near the full mark ?

 

[Borsig]

Excess oil increases pressure inside the crankcase, which can blow seals.

There are other negatives as well.

 

[z28dug]

A 1/2 inch isn't anything to worry about. Look at your dipstick. The difference between the full and add marks is a quart. A 1/2 inch may at most be a pint. An extra pint of oil is no big deal. Seriously doubt there would be any foaming.

 

[Doug Just Doug]

Me, I'd take it back and have the dealer correct the mistake, just for the piece of mind. I wouldn't want to just guess at how much it might be over, and whether it might blow a valve seal as a result. But I'm a former jet fighter mechanic, so I worry about things. :^)

 

[jdog1]

The real question is How Many Posts Are Needed To Get Answer?

 

[eagleeye]

merged threads.

one problem, one thread,:frown2:

 

[Yoda_One]

This is asked every couple of months
....Please use the Search function FIRST before posting a question especially if you think it was probably asked before over the Last 10 Years.....

Laughing at Oneself and with Others is Good for the Soul

 

[z28dug]

Me, I'd take it back and have the dealer correct the mistake, just for the piece of mind. I wouldn't want to just guess at how much it might be over, and whether it might blow a valve seal as a result. But I'm a former jet fighter mechanic, so I worry about things. :^)

Why should you worry, you were still on the ground......now the pilot on the other hand......:grin2:

 

[AWDFTW]

As mentioned before, there is no danger to a minor overfill. Put an extra 2-3 quarts in a 5 quart sump...that'll be an issue.

1/4th to 1/2 a quart overfill...wouldn't worry.

 

[johnre]

Really not an issue for 0.5", but pull it out with a siphon pump in the dipstick tube if it really bothers you, or do the aforementioned drain / refill procedure suggested by Texan.

What do you think happens when you corner hard and the oil sloshes over to the outside of the sump? Or when you take significant grades ascending or descending?

 

[Doug Just Doug]

Why should you worry, you were still on the ground......now the pilot on the other hand......:grin2:

...probably owed me a beer. :smile2:

 

[jbandl]

found useful info: a pint over is too much

The dealer put in an extra pint at oil change (.6" over full; and if
readings are proportional with the 1.4"(1.1 usqt) between low and
full) I tried oil level search twice; two threads found did not have
good info.
So posted at gen-5; one response, not much info.
Then found the oil section; got grief for posting twice and not
searching; but still not much information.
But I found this:
"overfilling the engines just so they could say to the customer when
they returned for a follow up test that the oil level was normal.
Yes, dealers did that to screw with the results to avoid having to
put in a new block"

On third search I found this from 2013 ...
http://www.subaruoutback.org/forums...e/102833-techtips-overfilling-engine-oil.html
Subaru TechTips,March/July 2013 "Too Much Oil in the Engine:
"What if it’s just a little over full, say half-quart?
... Excess will just burn off? ... Wrong.
...just half-quart over full could result in a drivability concern...
...drain the excess oil and see if the condition is corrected.
...most noticeable when accelerating up a grade.
...ECM using the SSMIII, you may notice knocking correction
occurring at the same time you experience a surging sensation....
distance between the Low and Full marks is approx 1 L/1.1usqt."

So I now know a pint (.6") over is too much, but I assume
that 1/8" is okay in the crude measuring setup.
So aside from any excess pressure or foaming concern,
just a pint over can cause a problem. The manual warned us.

 

[Yoda_One]

Chicken Little The Sky is Falling.

Laughing at Oneself and with Others is Good for the Soul

 

[provels]

Nothing to worry about. Mine was delivered new at about 3/8" over. Manual says 5.1 qts US, when I do an oil change I use a 5 qt bottle and that fills right to the line.

 

[traildogck]

Since the only drivabilty concern really identified is "more knock correction".

I would say NBD, Subarus knock and ping like h*ll anyway trying to eak out these mpg numbers everyone likes. Give it a minute or 2 and then it can end up in one of the "consumption" threads...It will be alright.

(.Y.)

 

[fixitfox]

Overfill caused oil pump failure?

I accidentally put an extra quart of Rotella T-6 in my tractor -- 6 instead of 5. Within an hours run time the shaft off the cam shaft to the oil pump broke. Foaming?