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How much residual oil leftover after oil change? #1366890
02/08/09 11:06 AM
02/08/09 11:06 AM
Joined: Jan 2009
Posts: 2,460
Rochester, MI, US, World
Klutch9 Offline OP
Klutch9  Offline OP
Joined: Jan 2009
Posts: 2,460
Rochester, MI, US, World
I got to thinking about this the other day. Is there just a thin film left on all surfaces after the oil is drained (and filter replaced too)? I ask because i plan on doing a UOA after my next change, but i used a little ATF in my oil before the last drain, and im wondering if there is enough of it still in my engine to throw my results off just a bit...?


'11 Fusion SE 2.5L - 79k miles - HK 0w20 syn, Wix XP filter
'08 Sedona LX LWB 3.8L - 126k miles - Havoline HM 5w20, Auto7 filter
Re: How much residual oil leftover after oil change? [Re: Klutch9] #1366915
02/08/09 11:28 AM
02/08/09 11:28 AM
Joined: Dec 2003
Posts: 9,795
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,795
Florida, Cape Coral
0.7 quarts remain in my Mazda turbo (6.7 quart system). Oil remains in the oil cooler and lines + some in the engine. if you change oil brands you should do the UOA on the second oil change. Seems to be true for most engines as shown in UOAs. A different oil seems to need some running in? before setting down on the second oil change.

Last edited by Eddie; 02/08/09 11:29 AM.

CX5 Touring 2.5L :-)
Re: How much residual oil leftover after oil change? [Re: Eddie] #1366923
02/08/09 11:37 AM
02/08/09 11:37 AM
Joined: Jun 2003
Posts: 17,342
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,342
Deplorable in apple valley, ca
Quite a bit I'd think. An old V8 will still have 16 lifters full of oil, every low spot on the heads, oil pump etc.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: How much residual oil leftover after oil change? [Re: Eddie] #1366938
02/08/09 12:00 PM
02/08/09 12:00 PM
Joined: Jan 2009
Posts: 2,460
Rochester, MI, US, World
Klutch9 Offline OP
Klutch9  Offline OP
Joined: Jan 2009
Posts: 2,460
Rochester, MI, US, World
 Originally Posted By: Eddie
0.7 quarts remain in my Mazda turbo (6.7 quart system). Oil remains in the oil cooler and lines + some in the engine. if you change oil brands you should do the UOA on the second oil change. Seems to be true for most engines as shown in UOAs. A different oil seems to need some running in? before setting down on the second oil change.


ah ok. my problem is i rarely use the same oil twice lol. im pretty satisfied with my current fill, but i think im gonna still mess around with different oils to see which works best with my engine. Im gonna try Rotella 5w-40 synthetic on my next fill, and i think from then on out it'll either be that or Maxlife (what i have now. great for cold starts)

Last edited by Klutch9; 02/08/09 12:02 PM.

'11 Fusion SE 2.5L - 79k miles - HK 0w20 syn, Wix XP filter
'08 Sedona LX LWB 3.8L - 126k miles - Havoline HM 5w20, Auto7 filter
Re: How much residual oil leftover after oil change? [Re: Klutch9] #1366956
02/08/09 12:33 PM
02/08/09 12:33 PM
Joined: Feb 2008
Posts: 3,130
Phila,PA
rg200amp Offline
rg200amp  Offline
Joined: Feb 2008
Posts: 3,130
Phila,PA
My LS calls for 6.5 quarts. When I change it (the level stays the same for the whole OCI. No make up oil needed) I have to put in exactly 6.5 quarts to get the level on the upper end of the dipstick.

SO The sump more than likely holds 7 quarts and I can only change 6.5.


// 2013 Subaru WRX //
SOLD:
-11 Volkswagen Jetta
-04 Lincoln LS
-01 Ford F250
-04 Mazda Rx-8
-97 Jeep Wrangler
-97 BMW M3
-97 Nissan Maxima

Re: How much residual oil leftover after oil change? [Re: rg200amp] #1366960
02/08/09 12:37 PM
02/08/09 12:37 PM
Joined: Aug 2004
Posts: 3,297
Raleigh ,NC CSA
rshaw125 Offline
rshaw125  Offline
Joined: Aug 2004
Posts: 3,297
Raleigh ,NC CSA
I don't think there is much left unless you don't let it drain very long. I have taken engines apart that the oil was left to drain for a week or so first. Maybe a few ounces remained. If I want a good oil change I leave the drain plug out over night. It has stopped dripping by the time I get back to it.


2012 Porsche Carrera S
2016 Ford Edge 2.0
2002 Taurus Vulcan SOLD
2006 Explorer SOLD
Re: How much residual oil leftover after oil change? [Re: rshaw125] #1366994
02/08/09 01:10 PM
02/08/09 01:10 PM
Joined: Oct 2008
Posts: 682
ontario canada
scoobie Offline
scoobie  Offline
Joined: Oct 2008
Posts: 682
ontario canada
same here, my subaru calls for 4.4l WalMart drained it, and it needed exactly 4.4l to fill to max line. i warm up the engine before an oil change, and if the drain is on one side, i'll drive it up ONE ramp, to tip the car that way. if the drain is on back, i'll drive up TWO ramps, to tip the car back. let it drain for half an hour, and most everything will come out. i didn't open the engine to check, but i find the engine takes what the manual will say, if drained this way.

Re: How much residual oil leftover after oil change? [Re: Klutch9] #1367071
02/08/09 03:01 PM
02/08/09 03:01 PM
Joined: Dec 2006
Posts: 730
The IL
SevenBizzos Offline
SevenBizzos  Offline
Joined: Dec 2006
Posts: 730
The IL
I've gotten probably what seems like a lot (>12oz.) just by lifing the front of the car higher with the jack stand. I'm sure there's more to be found inside the engine...

Re: How much residual oil leftover after oil change? [Re: SevenBizzos] #1367123
02/08/09 04:14 PM
02/08/09 04:14 PM
Joined: Oct 2005
Posts: 11,363
PA
d00df00d Offline
d00df00d  Offline
Joined: Oct 2005
Posts: 11,363
PA
Look in your user manual, in the section where it tells you how much oil you need to do an oil change. There should also be a number for "total capacity" or something. Subtract the oil change number from the total capacity number and that's how much is left in the engine when you drain the sump.


2011 Mazda RX-8 R3
Mobil Super 5w-20
Re: How much residual oil leftover after oil change? [Re: d00df00d] #1367130
02/08/09 04:19 PM
02/08/09 04:19 PM
Joined: Aug 2007
Posts: 101
United States
caveatipse Offline
caveatipse  Offline
Joined: Aug 2007
Posts: 101
United States
Haha I am laughing because my Yaris takes I think 2.9 quarts of oil lol. I am comparing it to soe of these big engines and it seems like so little.

Re: How much residual oil leftover after oil change? [Re: caveatipse] #1367174
02/08/09 04:50 PM
02/08/09 04:50 PM
Joined: Oct 2008
Posts: 682
ontario canada
scoobie Offline
scoobie  Offline
Joined: Oct 2008
Posts: 682
ontario canada
my little dodge colt takes 3.5l, i just make sure it's tipped the right way to get out every last drop. it all drains out in 30 min.

Re: How much residual oil leftover after oil change? [Re: scoobie] #1367178
02/08/09 04:53 PM
02/08/09 04:53 PM
Joined: Mar 2006
Posts: 5,619
Buffalo, NY
Nickdfresh Offline
Nickdfresh  Offline
Joined: Mar 2006
Posts: 5,619
Buffalo, NY
I doubt much more than .25 of a QT stays in most modern engines...

Re: How much residual oil leftover after oil change? [Re: Klutch9] #1367231
02/08/09 05:34 PM
02/08/09 05:34 PM
Joined: Dec 2006
Posts: 67
Florida
Saab9000 Offline
Saab9000  Offline
Joined: Dec 2006
Posts: 67
Florida
 Originally Posted By: Klutch9
I got to thinking about this the other day. Is there just a thin film left on all surfaces after the oil is drained (and filter replaced too)? I ask because i plan on doing a UOA after my next change, but i used a little ATF in my oil before the last drain, and im wondering if there is enough of it still in my engine to throw my results off just a bit...?


Why the ATF?

Re: How much residual oil leftover after oil change? [Re: Klutch9] #1367255
02/08/09 05:58 PM
02/08/09 05:58 PM
Joined: Aug 2008
Posts: 793
Vancouver, BC
Liquid_Turbo Offline
Liquid_Turbo  Offline
Joined: Aug 2008
Posts: 793
Vancouver, BC
For Hondas and Acuras w/ K20As, there is 1.1 quarts residual:


Re: How much residual oil leftover after oil change? [Re: Saab9000] #1367257
02/08/09 06:00 PM
02/08/09 06:00 PM
Joined: Mar 2003
Posts: 8,711
Nothern USA
labman Offline
labman  Offline
Joined: Mar 2003
Posts: 8,711
Nothern USA
I think it varies from engine to engine. I know my truck has a huge pool of oil on the top of the head. It also has a section of the oil pan that never drains.

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