Amsoil SVG 75W90, 40K, 04 Duramax

[TXHunter]

Based on the recommendations from the first sample with Blackstone I kicked up
the OCI 10K miles on this first run of Amsoil. Looks like I should have extended
this one further. Plan to take this next one to at least 50K, if not longer.

Make/Model: GM Rear Differential
Vehicle: 2004 Chevy 2500HD

Code:


OIL SVG 75w90 VAL Syn 75W90

MILES IN USE 39,780 29,976

MILES ON UNIT 146,130 106,350

SAMPLE TAKEN 7/3/13 10/20/11

MAKE UP OIL 0 0



IRON 59 189

CHROMIUM 0 1

NICKEL 2 6

ALUMINUM 0 1

COPPER 0 1

LEAD 0 0

TIN 0 2

CADMIUM 0

SILVER 0 0

VANADIUM 0

SILICON 12 5

SODIUM 3 15

POTASSIUM 0 1

TITANIUM 0 2

MOLYBDENUM 0 0

ANTIMONY 0

MANGANESE 4 13

LITHIUM 2

BORON 109 284

MAGNESIUM 0 3

CALCIUM 24 64

BARIUM 0 1

PHOSPHORUS 926 2192

ZINC 14 37



Water %
SUS @ 210F 73.1

Visc @ 100C 17.9 13.7

TAN 2.10

Oxidation 45

Nitration 4

Insolubles % 0.3

Flashpoint 375


Oil Analysis Vendor Comments:
Flagged data does not indicate an immediate need for maintenance action. Continue
to observe the trend and monitor equipment and fluid conditions. Zinc is slightly
high for this lubricant.

 

[buster]

Wow, superior results with the SVG. I think I'm going to change the rear diff over to Amsoil SVG.

 

[147_Grain]

Love the Severe Gear Oil. Have been using it for over a decade. The 2013 Outback and 2005 Sorento are getting improved MPG with Amsoil's 75W-90.

 

[TXHunter]

Does the viscosity level of the Severe Gear look right? Blackstone was showing a range of 12.2-15.8 for 75-90W.

 

[Pablo]

Originally Posted By: dhellman12
Does the viscosity level of the Severe Gear look right? Blackstone was showing a range of 12.2-15.8 for 75-90W.


?? Blackstone sometimes.....is just goofy.

Correct range is 13.5-18.5.

 

[INDYMAC]

It's nice to see a 75w-90 gear oil stay in grade and protect well in a HD rear diff application. BZ to Amsoil!

 

[dnewton3]

I'd put SVG in and then not even touch it (except to verify the level occasionally) for 100k miles.

Why use an expensive syn and dump it so soon? SVG is one of Amsoil's better products, and can EASILY handle ultra long OCIs as long as they don't get immersed in water.

 

[SteveSRT8]

^^^What he said.

Once you do an initial change to get the break in debris out then let her rip. No need to change it at all under 100k miles or even more as long as you don't regularly submerge her!