2006 GMC Sierra 4.3l Shell Syn5W30 5.8k/73.6k mi

[George7941]

Code:


OIL Formula Shell Synthetic 5W30

MILES IN USE 5,800

MILES 73600

SAMPLE TAKEN 12/29/13



ALUMINUM 4

CHROMIUM 1

IRON 13

COPPER 1

LEAD 4

TIN 1

MOLYBDENUM 49

NICKEL 1

MANGANESE 0

SILVER 0

TITANIUM 0

POTASSIUM 1

BORON 0

SILICON 18

SODIUM 4

CALCIUM 2476

MAGNESIUM 9

PHOSPHORUS 726

ZINC 859

BARIUM 1



WATER 0.0

cSt @ 212ºF 9.9

Fuel% 0

Antifreeze% 0

Sulfation UFM# 25

Oxid UFM# 21

Nitration UFM@ 14


Silicon is a bit high but this engine started off with 90ppm of silicon and it has been slowly decreasing. I suspect gasketing or seals as the source of the silicon. I remember seeing somebody else's 4.3 UOA with high Silicon.

I am happy with the way my engine is wearing.

 

[dernp]

It sure is wearing nicely. I think you found the sweet spot for your oci.

 

[George7941]

I change the oil twice a year, spring and late fall. This year, the change was delayed a bit. I only put in 11k mi a year on the truck.