Mobil 1 Viscosity 5W-30

FMC

Joined
Mar 1, 2010
Messages
148
Location
Phila, Pa
I had a UOA done on Mobil 1 5W-30. Mobil states the viscosity @100c is 10, but my UOA with 6300 miles shows 11.6.

Why would the oil thicken ? I thought it would thin out.


Thanks
 

OVERKILL

$100 Site Donor 2021
Joined
Apr 28, 2008
Messages
53,064
Location
Ontario, Canada
I had a UOA done on Mobil 1 5W-30. Mobil states the viscosity @100c is 10, but my UOA with 6300 miles shows 11.6.

Why would the oil thicken ? I thought it would thin out.


Thanks
Well, first you have to assume that the lab is right, and that the PDS is right. Some of the oils, and subsequently their spec sheets, changed with the move to GF-6/SP.

There are three factors in play that affect viscosity in service:
1. Fuel dilution - Driving down viscosity
2. VII shearing - Driving down viscosity
3. Oxidation - Driving up viscosity

Typically, blenders shoot for balancing #2 and #3 so that the oil remains roughly the same viscosity over its planned service interval. That is, as some of the VII polymers shear, a bit of base oil oxidation compensates for it, balancing it out. Where a wrench gets thrown into this party is with #1, which will drive down overall viscosity regardless and has become more and more prevalent with the introduction of GDI/TGDI.

If you have a port injected engine, fuel dilution is less likely to be an issue and subsequently, it's possible to see a bit of oxidative thickening in service.
 
Joined
Aug 6, 2022
Messages
55
Location
Deep South
It used to be 11 or 11.1. Mobil must have changed their formulation once again. Your oil may be a previous formulation with a higher viscosity.
 
Joined
Aug 6, 2022
Messages
55
Location
Deep South
It used to be 11 or 11.1. Mobil must have changed their formulation once again. Your oil may be a previous formulation with a higher viscosity.
The pour point changes as well. Used to be -49F, now -43.6F (same as AFE 0W-30).
 
Joined
May 17, 2009
Messages
18,622
Location
N.H, U.S.A.
I had a UOA done on Mobil 1 5W-30. Mobil states the viscosity @100c is 10, but my UOA with 6300 miles shows 11.6.

Why would the oil thicken ? I thought it would thin out.


Thanks
What did the oil look and smell like? Was it service for a year?

M1 FS Series PDS for API-SP that I have on file reads:

Kinematic Viscosity @ 100 C, mm2/s, ASTM D445 _____________________ 11.4
 

FMC

Thread starter
Joined
Mar 1, 2010
Messages
148
Location
Phila, Pa
2021 Ford Explorer Utility Police. 3.3L V6 has both Port and Direct Injection

3 months / 6,300 miles / 2,000 hrs
 
Joined
May 17, 2009
Messages
18,622
Location
N.H, U.S.A.
2021 Ford Explorer Utility Police. 3.3L V6 has both Port and Direct Injection

3 months / 6,300 miles / 2,000 hrs
So almost 90% stationary idling hours.

You must service a fleet of squads.

Do you see any trace of K in the UOA report.

Any concerns noted by the operator(s)
 
Joined
Aug 30, 2004
Messages
28,207
Location
CA
2021 Ford Explorer Utility Police. 3.3L V6 has both Port and Direct Injection

3 months / 6,300 miles / 2,000 hrs
That is way too long. I would expect an OCI in the 200-300 hour range. What interval did the Oil Life Monitor suggest?
 
Joined
Oct 22, 2009
Messages
8,034
Location
Wet side WA
2021 Ford Explorer Utility Police. 3.3L V6 has both Port and Direct Injection

3 months / 6,300 miles / 2,000 hrs
Seems rather odd the math doesn't work for me 2000 hours is a little over 83.33 days of 24 hours on the road. Is that 2000 hours for the life of the vehicle rather than this one OCI?
 

FMC

Thread starter
Joined
Mar 1, 2010
Messages
148
Location
Phila, Pa
20220926_112908.jpg




TITAN LABS
 

FMC

Thread starter
Joined
Mar 1, 2010
Messages
148
Location
Phila, Pa
Seems rather odd the math doesn't work for me 2000 hours is a little over 83.33 days of 24 hours on the road. Is that 2000 hours for the life of the vehicle rather than this one OCI?
This unit has a total of 4,850 hrs

Put into service 2/15/22
 
Joined
Dec 28, 2011
Messages
4,301
2000 hours! Post the wear and silicon #'s. 5,000 oci might be better .02.

Cop cars idling for ever and ever. Never liked that part of the job but I understand the importance in certain locations. I am a Nazi when it comes to idling for no necessary need.
 
Top