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27k mile UOA Report: ’99 SOHC

aldive

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Year, Model & Trim Level
1999 XLT
The data is from my '99 SOHC using Amsoil Bypass filtration ( Dead Link Removed ) and Amsoil Signature Series 0W30 oil (Dead Link Removed ). The mileage on this oil sample is 27,204 miles.

This OCI was 18 months. This is the longest time frame I have used for an OCI.

No oil filters were changed nor was any make up oil added..

The UOA on all the samples was performed by Blackstone Labs ( Dead Link Removed ).

The first column represents the virgin oil ( VOA ) and the second is this sample and the last represents Blackstone’s average of data collected for this type motor.

Aluminum 0 8 5
Chromium 0 2 1
Iron 2 31 10 16
Copper 0 9 6
Lead 0 0 4
Tin 0 0 1
Molybdenum 0 14 43
Nickel 0 1 0
Manganese 0 0 1
Silver 0 0 0
Titanium 0 0 0
Potassium 0 1 2
Boron 64 15 47
Silicon 4 12 9
Sodium 0 13 18
Calcium 1722 1937 2402 2039
Magnesium 598 199 202
Phosphorus 822 712 748
Zinc 958 837 893
Barium 0 0 1
---------------------------

TBN 12.0 2.0 2.1

---------------------------
This sample Typical Amsoil 0W-30
Viscosity @ 210degF: 64.3 56-64
Flashpoint in deg F 410 390 >395
Fuel% 0.0 <2.0
Antifreeze% 0.0 0.0
Water% 0.0 0.0
Insolubles % 0.6 < 0.6


Blackstone's comments: AL: No problems were found in the latest sample from your Ford Explorer. Iron was rather high but is probably due to the long oil run. Wear generally increased in this sample but nothing was high enough to warrant any serious concern. The viscosity of the sample was just slightly high but shouldn't be a problem and no harmful contaminants were seen. The TBN was 2.0 thus you had active additive remaining. For an oil run this long wear looks great!


My conclusions:

This UOA further validates extended OCI using bypass filtration and high quality oil. Even though this oil is still “good” and I could get more miles out of it, but based on this UOA, especially the thickening of the oil to 15w40 and my quest for mileage, I changed the oil and filters and will go for another 30k or more miles. The new oil I used was same Amsoil Signature Series 0w30 oil (Dead Link Removed ) and Amsoil EaO/EaBP filters.

This motor has never used nor leaked any oil whatsoever.
 






Thats a long OCI for sure...

The iron did catch my eye, even before reading blackstones comment...
 






High iron is probably from piston ring and cylinder wear,
or possibly valve train.
The Boron is depleted, so assuming it's an EP additive,
at least some metal-to-metal contact is taking place.

That's an amazing UOA for sure though, and my hat's
off to you Al for running oil that long, bypass filter
or not......:salute:


BTW, how many total miles on the engine now?
 












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