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#4659405 - 02/07/18 06:58 PM Viscosity thickening, long drain
pitzel Offline


Registered: 09/13/04
Posts: 1478
Loc: Saskatchewan, Canada
90,000km/10 years since my last oil change, Esso XD-3 0W-30 oil.

High temperature Viscosity thickening is a well known feature of long drains. But just searching, I'm not able to find any good material, UOA's, etc., on what happens to the cold temperature viscosity of motor oil subjected to long drains.

XD-3 0W-30 is a Group IV PAO oil, with very high viscosity index basestocks. After 90,000k (56k miles), its probably safe to assume that any viscosity modifiers have been depleted. But in an oil with minimal viscosity modifiers due to high VI basestocks, would cold-temperature viscosity thickening be significant?

Any good papers? I see one, "ASTM STP621_S4 Cold Starting and Oil Pumpability —An Evaluation of New and Used Oils in Gasoline Engines", but its very old (~1980) and implies that a 'used' 10W-30 becomes a 20W-40 in their case. Not sure such logic is applicable to modern synthetics though which don't rely upon viscosity modifiers.
_________________________
Change your thinking...not your oil!

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#4659426 - 02/07/18 07:18 PM Re: Viscosity thickening, long drain [Re: pitzel]
Dyusik Offline


Registered: 09/26/14
Posts: 1984
Loc: US-WA
With a 56 k mile stretch, what is the sump size?
_________________________
95 Cherokee 190K DELO 10W30,XG8
07 IS250 97K FB ?w??,FULL
04 YZF-R1 19K DELO 15w40,XG7317
99 HD XL1200S 18K VR1 20w50,1515
14 RX450h 30k PP 0w20,NAPAG

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#4659428 - 02/07/18 07:21 PM Re: Viscosity thickening, long drain [Re: Dyusik]
pitzel Offline


Registered: 09/13/04
Posts: 1478
Loc: Saskatchewan, Canada
About 5L or so.
_________________________
Change your thinking...not your oil!

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#4659452 - 02/07/18 07:49 PM Re: Viscosity thickening, long drain [Re: pitzel]
Silk Offline


Registered: 07/26/03
Posts: 4562
Loc: New Zealand
10 years, that's a line in the sand I hope to get to.
_________________________
1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.

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#4659478 - 02/07/18 08:16 PM Re: Viscosity thickening, long drain [Re: pitzel]
2004tdigls Offline


Registered: 10/31/11
Posts: 484
Loc: maple ridge, bc
nothing personal but this is a ridiculous OCI, just change the oil

I can't imagine what the inside of engine looks like

5 liters?

wow

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#4659502 - 02/07/18 08:33 PM Re: Viscosity thickening, long drain [Re: pitzel]
Ducked Offline


Registered: 10/25/12
Posts: 4368
Loc: Taiwan
Papers are often intertesting and informative background, but they won't tell you the status of your oil and engine. For that you need testing, DIY and/or contracted out.

UOA doesn't normally make sense to me since it costs more than an oil change, but here you're pushing the envelope into "research" territory, so it'd be justified, and if you havn't done it you perhaps should.

I'd also look into DIY viscosity and pH testing (which needn't be very precise to detect extreme changes) and "quality" testing like the blotter spot test.

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#4659513 - 02/07/18 08:40 PM Re: Viscosity thickening, long drain [Re: pitzel]
Matagonka Offline


Registered: 02/03/15
Posts: 469
Loc: NC
I don't get why people like to stretch their oil changes this far. Oil is freaking cheap!

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#4659524 - 02/07/18 08:47 PM Re: Viscosity thickening, long drain [Re: pitzel]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 705
Loc: Canada


With a long drain like that and if the oil looks thick on the dip stick, I would have run the engine till warm then added
2 cups of kerosene and let it idle for 30 minutes, then do the oil change, you'd get it all out and the engine would be cleaner!

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#4659544 - 02/07/18 09:10 PM Re: Viscosity thickening, long drain [Re: pitzel]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18170
Loc: Dallas,Tx USA
I'd think after 56,000 mile oil change that the engine would be toast.
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum 0W20



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#4659547 - 02/07/18 09:15 PM Re: Viscosity thickening, long drain [Re: pitzel]
FermeLaPorte Offline


Registered: 07/25/17
Posts: 472
Loc: Texas (south)
Change the oil, man
_________________________
Always Mobil 1
2014 1.6L Nissan Versa Sedan, 5 spd, 5k OCI.
2011 3.5L Chevrolet Impala, Automatic, 5k OCI.

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#4659558 - 02/07/18 09:32 PM Re: Viscosity thickening, long drain [Re: pitzel]
Vladiator Offline


Registered: 01/04/16
Posts: 728
Loc: NC

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3719052/40k_mile_OCI_pics#Post3719052

Here is OP's engine at 40k miles into this oil change back in 2015, when the oil was contaminated with coolant. Just change the oil, it's cheaper than repairs.
_________________________
Thicker oils give protection for severe operations such as driving in mountains, pulling a boat, dusty conditions, short trips, high rpm, overloading, overheating and overcooling. Thin oils give MPG.

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#4659589 - 02/07/18 10:14 PM Re: Viscosity thickening, long drain [Re: pitzel]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
I am truly impressed. That 3.1 was a TOUGH engine!

What oil filter change interval do you use?

Originally Posted By: pitzel

Details:
GM LH0 Engine (3.1L V6) manufactured 1992
January 2004, installed XD-3 0W-30 (100k)


https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3719052/
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4659632 - 02/08/18 01:20 AM Re: Viscosity thickening, long drain [Re: pitzel]
Garak Offline


Registered: 12/05/09
Posts: 24586
Loc: Regina, Saskatchewan, Canada
Cold weather performance generally slips as the oil is used. I believe slipping a "w" grade is acceptable in normal use. Over that OCI, I wouldn't venture a guess. wink
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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#4659912 - 02/08/18 10:43 AM Re: Viscosity thickening, long drain [Re: pitzel]
meborder Offline


Registered: 04/27/14
Posts: 840
Loc: SD - South Dakota
Quote:
90,000km/10 years since my last oil change, Esso XD-3 0W-30 oil


New gauntlet thrown down....
_________________________
Too many cars using too many different oils to list in 150 characters.

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#4660499 - 02/08/18 10:54 PM Re: Viscosity thickening, long drain [Re: meborder]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Originally Posted By: meborder
Quote:
90,000km/10 years since my last oil change, Esso XD-3 0W-30 oil


New gauntlet thrown down....


Pretty much.

I do not have the balls to try to top that.
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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