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Old 11-14-2010, 08:50 PM   #1
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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?

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Old 11-14-2010, 08:50 PM   #2
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yes it does.

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Old 11-14-2010, 08:58 PM   #3
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what are you changing oil in?
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Old 11-14-2010, 09:25 PM   #4
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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.
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Old 11-14-2010, 09:37 PM   #5
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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.
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Old 11-14-2010, 09:45 PM   #6
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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.
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Old 11-14-2010, 09:47 PM   #7
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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.
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Old 11-14-2010, 09:48 PM   #8
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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.
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Old 11-14-2010, 10:40 PM   #9
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The container was completely empty. And it's an 01 6 cyl.
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Old 11-14-2010, 10:42 PM   #10
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Originally Posted by mavrick300 View Post
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?
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Old 11-14-2010, 10:44 PM   #11
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Yup and only put 6 quarts in and it wasn't over either.
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Old 11-14-2010, 10:45 PM   #12
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Yup and only put 6 quarts in and it wasn't over either.
thats really strange. your engine is making oil.
the density change between 80F and 120F is only 2% which makes 6 quarts at 80F become 6.12 quarts at 120F.
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Old 11-14-2010, 10:46 PM   #13
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Lol that's what I said! Made a mess in the garage. oh well!
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Old 11-14-2010, 11:10 PM   #14
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Check the coolant level.
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Old 11-14-2010, 11:28 PM   #15
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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.
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Old 11-14-2010, 11:46 PM   #16
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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.
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Old 11-15-2010, 12:04 AM   #17
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Coolant in the oil would mean like a blown head gasket or something?
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Old 11-15-2010, 12:09 AM   #18
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Or a cracked block witch is really bad
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Old 11-15-2010, 12:11 AM   #19
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Quote:
Originally Posted by mavrick300 View Post
Coolant in the oil would mean like a blown head gasket or something?
could be a blown gasket also could be water pump.
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Old 11-15-2010, 12:47 AM   #20
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Originally Posted by mavrick300 View Post
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?
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Old 11-15-2010, 01:36 AM   #21
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I think it might be leaking from the water pump I'm not sure though.
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Old 11-15-2010, 06:19 AM   #22
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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.
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Old 11-15-2010, 08:40 AM   #23
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Ahem........ Man+measuring=






Sorry Just sayin'...........
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Old 11-15-2010, 08:51 AM   #24
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Ahem........ Man+measuring=

Sorry Just sayin'...........

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.
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Old 11-15-2010, 08:58 AM   #25
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strange for sure......
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Old 11-15-2010, 09:10 AM   #26
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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.
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Old 11-15-2010, 09:16 AM   #27
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Quote:
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Ahem........ Man+measuring=


Sorry Just sayin'...........

The best part, Linda...is that it went right over their heads!
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Old 11-15-2010, 09:23 AM   #28
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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.
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Old 11-15-2010, 09:30 AM   #29
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Old 11-15-2010, 11:40 AM   #30
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The best part, Linda...is that it went right over their heads!
Hey, that's what the big grin was for - recognition of what was said but wise enough not to comment/go there.
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.

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