Amsoil 10W/30 ATM * * '02 Jeep GC 4.7L HO

[47HO]

Interval: 1 year / 9,604 miles
Miles on Vehicle: 31,615
Sample Date: 04/04/05

code:

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Elements Sample Univ Avg

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Aluminum 2 4

Chromium 1 1

Iron 12 18

Copper 5 6

Lead 13 2

Tin 0 0

Moly 3 33

Nickel 1 1

Manganese 0 0

Silver 0 0

Titanium 0 0

Potassium 1 1

Boron 26 40

Silicon 3 8

Sodium 3 5

Calcium 1693 2548

Magnesium 566 90

Phosphorus 694 856

Zinc 830 1034

Barium 0 1



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Properties Tested Should Be

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SUS@210°F 75.4 59-65

Flashpoint 410 >370

Fuel
Antifreeze 0.0 0

Water 0.0
Insolubles 0.3 pre>

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TBN: 3.4





My previous UOA, using XL-7500 10w30.

 

[JohnBrowning]

Compared with the last UOA I would say that 6 months is a better OCI for this engine! The ware is 4 times greater then the 6 month interval even though the milage is only double! While it still looks good it looked better the other way!

I do not like how high lead is in this report!! It is slightly higher then the iron. It is more then 4 times higher then the previous report of about 1.2 the mile and 6 month OCI! Can this be explained some other way other then bad OCI for this engine?

 

[47HO]

It has been suggested that the use of a fuel system cleaner could be the cause of the lead spike. I did use a good dose of PI about a month prior to the sample.

 

[buster]

Wear is fine, other then Pb (not significant but to BITOG standards it is). Amsoil just thickens to much for what you pay for it. I have no idea where Amsoil came up with a TFOUT number of greater then 500 minutes. No way...

 

[47HO]

Buster, what is TFOUT number?

Also, note that on my run of XL-7500, the oil almost dropped to a 20 weight.

 

[haley10]

quote:

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Originally posted by 47HO:
Buster, what is TFOUT number?

Also, note that on my run of XL-7500, the oil almost dropped to a 20 weight.

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Thin Film Oxygen Up-Take Test = TFOUT.

This should be a good indicator of oxidation resistance and how long the oil might last.

I have no real explanation as to why the ATM didn't work better than the XL. Confuses me.

 

[TooSlick]

The K&N air filter is the culprit here ...It either needs to be serviced or it was incorrectly serviced and dirt is getting through it.

The moly (which was absent in the previous analysis), is coming from the friction reducing coating on your piston rings. The presence of chrome and nickel are secondary indicators of an air filter problem, ie abrasive wear of the stainless steel, intake/exhaust valves.

These silicon particles are too big to show up during a spectrographic analysis, but they are also contributing to the high Pb levels.

Switch back to the OEM paper filter and your result will improve significantly....

Insolubles are low @ 0.3% and there is plenty of life left on this oil w/ a BS TBN of 3.4 ....

TS

 

[buster]

The K&N could very well be the problem, but Si is low. I have to say though, the Fe wear number is very good regardless.

 

[TooSlick]

Most of the silicon goes out the exhaust in these situations with a newer engine and a tight ring seal. The wear occurs on the intake/exhaust valves and the piston rings.

 

[Spector]

Let me post a reply from the lab on my last analysis that had 21 ppm of lead in only 2200 miles.

"we see a lot of gas engines with lead levels that seem high. Usually if bering wear is a problem we will also see eleveated levels of tin and in bad cases aluminum. What we may be seeing is due more to a chemical reaction and some of the lead is going into solution and this would be more pronounced if condensation is involved."

9000 miles in a year is not a high mileage vehicle per year and the climate may be an issue as well. Not sure where the person lives.

As noted also, it may not be from the bearings. Personally, on all my engines, if I saw only 13 ppm of lead in 9000 miles I would be as happy as a pig in ****.