Recent Topics
Compressor Oil
by ricky66
7 minutes 49 seconds ago
Just broke the Maglite
by paulo57509
Today at 12:42 AM
04 Acura TSX- which ATF?
by Dohc98vteC
Today at 12:25 AM
7/31-8/27 Advance Sales Ad
by tenderloin
Today at 12:11 AM
Let the car cool off with the hood up ?
by Merkava_4
Today at 12:09 AM
Improving reverse lights
by buck91
Yesterday at 11:21 PM
What oil for plow.
by joegreen
Yesterday at 10:59 PM
My Camry is beginning to use more oil @ 116,000 mi
by coastalguy
Yesterday at 10:59 PM
MMO, the real deal.
by Clubber_Lang
Yesterday at 10:25 PM
Another Chrysler recall
by whip
Yesterday at 10:14 PM
A Drone Just Flew Over The House
by Warstud
Yesterday at 09:59 PM
Coolant for 68 plymouth 318
by mac9128
Yesterday at 09:47 PM
Newest Members
Janaya3, Weeeee, Jty, Gonzalo8575, gsniegow
50810 Registered Users
Who's Online
27 registered (Chris B., CELICA_XX, chriscreags, Bookmaker, ChrisW, Blasar, 5 invisible), 806 Guests and 230 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
50810 Members
64 Forums
217082 Topics
3417964 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Topic Options
#3176783 - 11/03/13 03:41 AM Shear Stability
Spooner65 Offline


Registered: 04/13/12
Posts: 44
Loc: California
I drive a 7.3L powerstroke, which utilizes a a high pressure oil pump that is notorious for shearing oil.

I want to learn what makes an oil shear stable. I have googled what I can, but cant find much in the way of instruction, just product descriptions and the such.
_________________________
2002 Ford F250 7.3L

Top
#3176807 - 11/03/13 05:55 AM Re: Shear Stability [Re: Spooner65]
Quattro Pete Offline


Registered: 10/30/02
Posts: 24868
Loc: Illinoistan
Originally Posted By: Spooner65
I want to learn what makes an oil shear stable.

Quality oil bases and low amounts of viscosity index improvers.
_________________________
'02 530i (PU 5W-40)
'08 C300 4Matic (M1 0W-40)
'13 F700 GS (Spectro 15W-50)

Top
#3176859 - 11/03/13 07:30 AM Re: Shear Stability [Re: Spooner65]
gfh77665 Offline


Registered: 09/01/08
Posts: 2234
Loc: Southeast Texas
Mix in a qt. or two of single weight oil.

Top
#3176874 - 11/03/13 07:41 AM Re: Shear Stability [Re: Quattro Pete]
gregk24 Offline


Registered: 04/13/13
Posts: 2554
Loc: FL, USA
Originally Posted By: Quattro Pete
Originally Posted By: Spooner65
I want to learn what makes an oil shear stable.

Quality oil bases and low amounts of viscosity index improvers.


This ^^^
_________________________
2006 Honda Accord LX 2.4 i-vtec 122K
Honda Genuine Synthetic Blend 0w20 Fram Ultra

2005 Chevy Uplander 3.5 114K
Castrol Edge FST EP 10w30 Fram Ultra

Top
#3176926 - 11/03/13 08:38 AM Re: Shear Stability [Re: Spooner65]
andyd Offline


Registered: 09/25/04
Posts: 3677
Loc: Marshfield , MA
No tribologist, but doesnt the same size molecules in synthetic oil help this too? I'm a cheap dino proponent, so I dont pay attention to this. laugh
_________________________
2 1988 BMW 528e 20w50 dino, STP filter

1994 Ranger ,600$ Rat, 5w30 dino, STP filter

Top
#3178225 - 11/04/13 01:30 PM Re: Shear Stability [Re: Spooner65]
Ken2 Offline


Registered: 12/02/02
Posts: 6073
Loc: Washington St.
Is there any good brand name 15W-40 diesel engine oil that will NOT do a good job in his 7.3? I think they all are formulated to work very well in that engine, very well in many other engines that use the engine oil as the hydraulic fluid in the injections system, and very well in many more engine designs.

Use the top brand name oil where you prefer the color of the label and sleep well. Your engine is well protected:
Chevron/Texaco
Shell/Pennz
ConocoPhillips76Kendall
Valvoline
ExxonMobil
etc., etc.
_________________________
Every gun that is made, every warship launched..a theft from those who hunger and are not fed, those who are cold and not clothed.
Gen. Eisenhower


Top
#3178450 - 11/04/13 05:10 PM Re: Shear Stability [Re: Spooner65]
roadrunner1 Offline


Registered: 04/08/09
Posts: 777
Loc: oh
A 10w-30 is much more shear-stable in any HEUI system.
The shearing doesn't seem to hurt anything, but many of us have found that lighter oil definitely helps with cold starts.

5w-40 will also do the trick, just cost more. Also Chevron is offering a 5w-30 HDEO, I'm not sure if its even available yet but I have seen the advertisement.
_________________________
'07 f350 6.0

Top