M1 10w30, 8.1L (496ci), 2001 Chevy 2500HD, 4K miles, 1/2 with bypass filter

[RavenTai]

UNIT NUMBER: 01 CHEVY
EQUIPMENT MODEL: 8.1L 496 CI V-8
FUEL TYPE: Gasoline (Unleaded)
OIL USE INTERVAL: 4,013 Miles
OIL TYPE & GRADE: Mobil 1 10W/30 (Gas)
MAKE-UP OIL ADDED: 3 qts (sump capacity 9QT)

Blackstone comments: Nice improvement in sodium. We don't think it was a coolant issue--if it was, it would still be present, especially since you ran this oil longer than the last. Wear still looks fine, showing no changes that would indicate a new problem in your GM engine. Insolubles (oil oxidation due to heat, use and blow-by) were low at 0.3%, showing good oil filtration and complete combustion. Silicon was low at 9 ppm, showing no problems at the air filtration/induction system. You could go longer on the oil if you wanted. Try 5000 miles next time.

code:

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MI ON OIL 4,013 2,161 6,692 M1 10w30

MI ON UNIT 49,917 48,066 45,904 VOA

TBN No Data No Data 5.3 10-12.5

ALUMINUM 5 3 4 0

CHROMIUM 1 1 1 0

IRON 21 11 26 1

COPPER 3 3 5 0

LEAD 16 18 51 0

TIN 2 1 4 0

MOLYBDENUM 57 82 93 69

NICKEL 1 0 1 0

MANGANESE 0 0 0 0

SILVER 0 0 0 0

TITANIUM 0 0 0 0

POTASSIUM 7 2 2 0

BORON 138 170 159 190

SILICON 9 5 8 3

SODIUM 2 7 8 9

CALCIUM 3177 3,562 3,609 2,976

MAGNESIUM 22 21 31 16

PHOSPHORUS 799 804 920 749

ZINC 905 1,066 1,155 827

BARIUM 0 0 0 0

\

sus viscosity@

210f 64.1 63.0 65.4 58.3

flash point 410 400 365 390

fuel%
antifreze% 0 0 0 No Data

water% 0 0.0 0.0 No Data

insoluables% 0.3 0.2 0.3 No Data

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Fresh oil values taken from Mobil 1 Virgin Oil Analysis Compendium . But I think Mobil has tweaked the formula since then including thickening it


the oil was not changed at the 48k sample but a Oilguard eps-20 was installed so excluding the make-up oil most of witch was to fill the new filter this oil was run 2K with and 2k without bypass filtration

I am not sure what to think of this, I am going to look at the #'s for a wile

 

[TooSlick]

Your rate of bearing wear has dropped way down, which is the main benefit I see with bypass filters in gas engines. A bypass filter won't decrease valvetrain wear much in a gas engine, unless you run off road and ingest lots of dirt.

When you install by-pass filtration on a HD diesel, you also see a significant decrease in valvetrain and piston ring/cylinder wear, due to the removal of agglomerated soot particles ....

With this setup, I'd run Delvac 1, 5w-40 or the Amsoil 10w-30 - that should get the Fe and Pb down even lower. This is a pretty low rpm motor, so a thicker oil will work better.

 

[Chris B.]

Looks like a decent report! I like this engine, It is so powerfull it gives diesels a run for their money! Do you burn any oil?

 

[RavenTai]

I do love the power, If you are not pulling I think the gas is better, it makes a 6kLB truck feel like a sports car

but hate the cold start knock and high lead levels both make me wonder about the long term life of this motor.

Yes I burn quite a bit and have since it was new, there is a TSB from GM stating that replacing the intake bolts one at a time in the proper order and proper torque may fix, seams the GM intake gaskets are junk here also we are fortunate that there is no coolant in the intake or we would be in the same boat as all the other GM internal coolant leaker's I am going to try just re-torquing them first

 

[RavenTai]

quote:

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Originally posted by TooSlick:
With this setup, I'd run Delvac 1, 5w-40 or the Amsoil 10w-30 - that should get the Fe and Pb down even lower. This is a pretty low rpm motor, so a thicker oil will work better.

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agreed I am going to try delvac 1 just nost sure if on the next change or if I should give GC 2 OCI's (currently in the middle of 1st GC OCI)

 

[Al]

Well-I don't see much of an improvement especially considering the extra oil, less milage and half of that on a bypass. The only thing that went major down was the pb. Also note the potassium went up along with the Al. I would be mildly suspicious of an intake leak. You are going to have to keep a watchful eye here.