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-   -   Does oil expand when it heats up? (http://www.wranglerforum.com/f210/does-oil-expand-when-it-heats-up-68913.html)

mavrick300 11-14-2010 07:50 PM

Does oil expand when it heats up?
 
Ok so today I decided it was time to do my oil change. I drove to the auto parts store bought the stuff and drove back. I asked my dad if I needed to wait to let the engine cool down before I started and he said "no"(famous last words) so I unscrew the bolt and let the oil start draining a little spilled on to my hand so I went to the sink to wipe it off literally 30 seconds later I go back and my oil container is overflowing (7 and a half quarts) and I have to gab a folders coffee container and it fills up two of those! So I was just wondering if oil expands or something when it's hot?

jgano23 11-14-2010 07:50 PM

yes it does.

sdxmiller 11-14-2010 07:58 PM

what are you changing oil in?

Five-Oh 11-14-2010 08:25 PM

You either had something in your container already, or are misinformed on it's capacity. And your dad is right, you should do your oil change when the engine is warm.

s3nt3nc3d 11-14-2010 08:37 PM

Yeah, it expands (and thins) to an extent, but even with a warm engine, it wouldn't put out a huge amount more...to be honest, I don't think I usually get the same amount out as what I put in between what's still in the filter when I remove it and the small amount that's burned off since the last oil change.

I agree with the above... you should change it when the engine is warm.

TJeepman 11-14-2010 08:45 PM

Yes, there's some expansion, but not big enough that you would notice.

I usually start with a hot engine and let it cool down to luke warm when I change my oil. Hot oil can burn.

Some (the arguing types :) ) will argue that cold oil will drain just fine since it's multigrade and adapts to changing temperatures. My experience is that cold oil doesn't drain as fast or as well as warm oil as it drips forever.

neverfastenough1 11-14-2010 08:47 PM

The viscosity changes but not the amount. I agree that there was probably something in the container already. You always drain your oil while it is warm.

jasonwrangler 11-14-2010 08:48 PM

it expands but not by that much. I think either it had overfilled or the container was smaller than you think.
the idea of changing oil warm is that it flows faster and if theres dirt and metal in there, its been stirred up floating being drained out.

mavrick300 11-14-2010 09:40 PM

The container was completely empty. And it's an 01 6 cyl.

jasonwrangler 11-14-2010 09:42 PM

Quote:

Originally Posted by mavrick300 (Post 876431)
The container was completely empty. And it's an 01 6 cyl.

then it should come out no more than 6 quarts.
who changed the oil last time?

mavrick300 11-14-2010 09:44 PM

Yup and only put 6 quarts in and it wasn't over either.

jasonwrangler 11-14-2010 09:45 PM

Quote:

Originally Posted by mavrick300 (Post 876438)
Yup and only put 6 quarts in and it wasn't over either.

thats really strange. your engine is making oil.:rofl:
the density change between 80F and 120F is only 2% which makes 6 quarts at 80F become 6.12 quarts at 120F.

mavrick300 11-14-2010 09:46 PM

Lol that's what I said! Made a mess in the garage. oh well!

DevilDogDoc 11-14-2010 10:10 PM

Check the coolant level.

mavrick300 11-14-2010 10:28 PM

Coolant level? My jeep does go through coolant but I'm pretty sure it's the water pump just haven't gotten around to changing it yet.

s3nt3nc3d 11-14-2010 10:46 PM

The point he's making... if you put 6 quarts in last oil change and got 7 1/2 quarts out of the engine, then either you miscalculated the amount of oil that came out or you've gotten water/coolant in your oil.

mavrick300 11-14-2010 11:04 PM

Coolant in the oil would mean like a blown head gasket or something?

mavrick300 11-14-2010 11:09 PM

Or a cracked block witch is really bad

jasonwrangler 11-14-2010 11:11 PM

Quote:

Originally Posted by mavrick300 (Post 876584)
Coolant in the oil would mean like a blown head gasket or something?

could be a blown gasket also could be water pump.

DevilDogDoc 11-14-2010 11:47 PM

Quote:

Originally Posted by mavrick300 (Post 876522)
Coolant level? My jeep does go through coolant but I'm pretty sure it's the water pump just haven't gotten around to changing it yet.

If the coolant isn't leaking out on the ground where do you suppose it's going, given your strange oil level? And what does the water pump have to do with the coolant disappearing?

mavrick300 11-15-2010 12:36 AM

I think it might be leaking from the water pump I'm not sure though.

Neil F. 11-15-2010 05:19 AM

If you had coolant in your oil, and you are indicating a quart, you would know. The oil would be brown and look like a milk shake.

If you really drained 7 1/2 and don't forget there is more in the filter, someone really F'ed up filling it up.

InfernoGirl 11-15-2010 07:40 AM

Ahem........ Man+measuring= :rofl:






Sorry ;) Just sayin'...........

TJeepman 11-15-2010 07:51 AM

Quote:

Originally Posted by InfernoGirl (Post 876923)
Ahem........ Man+measuring= :rofl:

Sorry ;) Just sayin'...........

:D
Some see the glass half full, this glass was over flowing.

Actually, I can't fathom 1.5 extra quarts of oil (if it is all oil) in the crank case without it being put there. We are missing something, and it isn't oil.

OregonTJ 11-15-2010 07:58 AM

strange for sure......

mavrick300 11-15-2010 08:10 AM

It definitely had coolant in it. It looked like hot fudge practically! How hard is it to replace a head gasket? And I know I only put 6 quarts in it last time. I always do 5 turn the jeep on check the oil and then if it needs it I add the 6th.

harwa004 11-15-2010 08:16 AM

Quote:

Originally Posted by InfernoGirl (Post 876923)
Ahem........ Man+measuring= :rofl:


Sorry ;) Just sayin'...........


:rofl::rofl::rofl: The best part, Linda...is that it went right over their heads! :p

Got 4 Lo 11-15-2010 08:23 AM

it is more like that it is thinner it is like syrup when it is cold it takes awhile to come out but when you heat it up it comes out like water it is the same thing as oil.

coolbreeze 11-15-2010 08:30 AM

------< 6 is not the question.......................................... .................................................. .or is it? :D

TJeepman 11-15-2010 10:40 AM

Quote:

Originally Posted by harwa004 (Post 876968)
:rofl::rofl::rofl: The best part, Linda...is that it went right over their heads! :p

Hey, that's what the big grin was for - recognition of what was said but wise enough not to comment/go there. :D
Quarts may be a bit confusing but we males know what a pint is. Most Jeep capacities are measured in pints but that's not what I'm referring to. :D


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