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#4455610 - 07/10/17 07:40 PM Heavy oil=hotter temp?
chartrue2 Offline


Registered: 12/28/06
Posts: 17
Loc: marlton, new jersey, usa
Hi all-decided to see what all the heavy oil hype was about and tried it in my 1997 Dodge B2500 van which is a Roadtrek motorhome conversion with a 5.2 (318) engine. Mileage is about 140K and I have always run 10/30W as per specs. I use a Scanguage II to monitor performance. Decided to use 10/40 for the summer months thinking it would offer a little more protection. Usual operating temperatures are around 198 degrees which climbs when pulling mountain grades. Oil pressure is noticeably higher (3/4 on the analog gauge instead of the usual 1/2 way) and temps seem to be consistently higher. Today when pulling a long 6 mile grade up the mountain, the temp rose to 215-218 instead of the usual 204-206. Does the heavier oil (Valvoline MaxLife 10/40) really make that much of a difference???

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#4455617 - 07/10/17 07:47 PM Re: Heavy oil=hotter temp? [Re: chartrue2]
tig1 Offline


Registered: 01/03/09
Posts: 13661
Loc: Illinois
Yes, oil temp will be a little higher with thicker oil, and 10-40 will not offer better wear.
_________________________
2007 Ford Fusion 227,000 miles
M1 0-20 EP
2017 Ford Fusion 49K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters


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#4455625 - 07/10/17 08:01 PM Re: Heavy oil=hotter temp? [Re: chartrue2]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
I sure love the ScanGauge.
_________________________
Multiple Diesel and Gasoline vehicles

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#4455718 - 07/10/17 09:20 PM Re: Heavy oil=hotter temp? [Re: chartrue2]
merconvvv Offline


Registered: 07/10/16
Posts: 682
Loc: il usa


Found this figure in lubetech article.
Seems like after 30 wt there is very little to gain.

Be interesting to see how the 10w40 does when the weather cools down a bit. Imagine its hot all over.
_________________________
1988 Mazda RX7 na PP 10w30 Noack 4.7
1994 Chrysler Concorde 3.3
1999 Ford Expedition 4.6 QSUD 10W30 NOACK 5.0

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#4455751 - 07/10/17 10:03 PM Re: Heavy oil=hotter temp? [Re: chartrue2]
zeng Offline


Registered: 09/01/15
Posts: 2189
Loc: Malaysia
Originally Posted By: chartrue2
Today when pulling a long 6 mile grade up the mountain, the temp rose to 215-218 instead of the usual 204-206. Does the heavier oil (Valvoline MaxLife 10/40) really make that much of a difference???

Yes.There is a difference.
Maxlife 10W40 is 13.94 cSt at 103*C; and
Maxlife 10W30 is 12.00 cSt at 95*C, despite being 8*C cooler.
One vote goes to lower operating temperature..... but at reduced oil film thickness ?

Oh no, 10*C higher temperature in 10W40 would half the oil life of 10W30!!!...... according to experts.
Then OCI 10W40 at 10k and compare against 10W30 OCI at 20k UOA ...... or
OCI 10W40 at 15k against 10W30 at 25k ...... and compare.

Do you need extra thick oil film thickness from 10W40, albeit at higher operating temperatures ?? .........
that's another topic for debate..

Btw,it would be interesting for OP to demonstrate if xW20 operates cooler than 10W30?

Originally Posted By: merconvvv


Found this figure in lubetech article.
Seems like after 30 wt there is very little to gain.


Concur with you, in gasoline engine applications ONLY.......
probably not .. in differential gear or hydraulic applications..... vis-a-vis thick vs thin oil comparisons.

Edit: Add info.


Edited by zeng (07/10/17 10:11 PM)

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#4455766 - 07/10/17 10:28 PM Re: Heavy oil=hotter temp? [Re: zeng]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18177
Loc: Dallas,Tx USA
Originally Posted By: zeng
Btw,it would be interesting for OP to demonstrate if xW20 operates cooler than 10W30?


This is what I'd like to see.
_________________________
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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#4455831 - 07/11/17 12:52 AM Re: Heavy oil=hotter temp? [Re: chartrue2]
slybunda Offline


Registered: 05/06/14
Posts: 439
Loc: UK
I went from 5w30 fuel economy oil hths 3 to 5w40 and the engine heated up faster and ran hotter than on the 30 and ran sluggish too. Ditched the oil in a week and went back to 5w30.
_________________________
1995 Ford Fiesta 1.6i 16v Si
2000 Toyota Celica 1.8 VVTL-i
2007 Toyota Aygo+ 1.0i

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#4455844 - 07/11/17 02:10 AM Re: Heavy oil=hotter temp? [Re: chartrue2]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2384
Loc: Balearic Islands , Spain
Yes a higher viscosity oil will raise oil temps a bit, no real point in putting in a 10W-40 in the summer really.
Anyway even at 218F you are still in "the safe zone" but i would recomend you either run a 10W-30 or 5W-40 full synthetic oil.
_________________________
1975 Ford Capri II Ghia 3000 V6, - Valvoline VR1 20W-50
1988 Ford Escort MkIV 1.6 Xr3i Cabrio, - Shell Rimula R4X 15W-40 HDEO.

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#4455850 - 07/11/17 02:35 AM Re: Heavy oil=hotter temp? [Re: chartrue2]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Does it have a clutch fan ? Maybe it's time for a dual electric fan conversion ...

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#4455856 - 07/11/17 03:03 AM Re: Heavy oil=hotter temp? [Re: merconvvv]
Olas Offline


Registered: 12/11/13
Posts: 3933
Loc: Manchester, England
Originally Posted By: merconvvv


Found this figure in lubetech article.
Seems like after 30 wt there is very little to gain.

Be interesting to see how the 10w40 does when the weather cools down a bit. Imagine its hot all over.


Depends entirely on the engine in question. Some new cars spec 50
_________________________
Cable ties should hold it

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#4455939 - 07/11/17 07:27 AM Re: Heavy oil=hotter temp? [Re: chartrue2]
HangFire Offline


Registered: 08/21/13
Posts: 2506
Loc: Central Maryland
No discussion of upper ring temps? Long history here on BITOG...
_________________________
Various musings: http://hangfire.net

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#4456053 - 07/11/17 10:05 AM Re: Heavy oil=hotter temp? [Re: chartrue2]
merconvvv Offline


Registered: 07/10/16
Posts: 682
Loc: il usa
http://www.lube-media.com/documents/cont...ndlubricity.pdf

Thats the article. I am not an oil expert. I just thought it was interesting. Anyways what iiii gather is that beyond hths of 3.3 or so minimal gains are to be had.
Then you have to add a safety margin to that 3.3 or so.
_________________________
1988 Mazda RX7 na PP 10w30 Noack 4.7
1994 Chrysler Concorde 3.3
1999 Ford Expedition 4.6 QSUD 10W30 NOACK 5.0

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#4456066 - 07/11/17 10:19 AM Re: Heavy oil=hotter temp? [Re: chartrue2]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 3970
Loc: New England
Shannow posted excerpts from a study showing the power losses due to oil thickness for a street and a racing engine, a thicker oil will naturally result in a greater loss than a thinner oil under the same operating conditions and the result is hotter oil. I noticed this in my own car when I switched from M1 5W30 (HTHS=3.1) to M1 5W30 ESP (HTHS=3.58) and was alarmed enough to post here asking what was going on...it totally makes sense when you think about it, though.

Shannow also mentioned that the increased temperature will not result in the thicker oil having a lower film thickness than the thinner oil under the same circumstances, there would be no point in using the thicker oil if that weren't the case.
_________________________
2014 Forester XT, 80500 miles
Last Change;
Valvoline Full Synthetic 5W30 d1G2
Tokyo Roki 15208AA170 filter

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