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Old 06-13-2003, 11:10 AM   #1
gsleve
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Member#: 12132
Join Date: Nov 2001
Default UOA For 2002 Impreza TS Wagon 10353k

Prior use of theschaeffers 7k blend 15w-40, use of AMSOIL 7500 ORIGINAL FORMULA was used from 500m to 25708K, from this this mileage forward SCHAEFFERS 7K BLEND 15W-40 WEIGHT. Filter used was a fram for the whole duration, this schaeffers was installed around 10/02

This vehicle preffered weight is 5w-30 or 10w-30 yet it also allows for the use of 10w-40 therefore I chose the 15w-40. Here goes, first sample on unit had 6561k when sample was pulled, Schaffers comments "oil contamination and additives normal. Increase drain to 8000k"

Same oil at with 10353k on it Schaffers comments "oil contamination and additives normal. Increase drain to 12,300k" Oil at this time was drained and installed Schaffers 5w-30 blend.

6561k................10353k
--------------------------------
Cu___3 ________ 4
Fe___17________ 20
Cr___0___________1
Al___7___________8
Pb___2__________2


Additives read as follows below
6561k....................10353k
----------------------------------
Moly 89__________106
Phos 1061_______1562
Zn 114__________1361
Mg 38____________56
Ca 3031_________3749
sodium 0__________0
Boron 0___________0
Anti 0_____________0
fuel n_____________n
H20 0_____________0
sili 12____________10
vis 13.55________15.54
sulfur 89___________2
oxid 15___________33
nitr 25____________48


Before the the drain of the last sample a trip of 1800m was taken to georgia. Yet throughout the oil's life it is continuous stop and go traffic with an occasional highway jaunt the vehicle had 36061k at the last drain now full with Schaffers 7k 5w-30. A 1/2 qt was added just before the 1800k trip,
schaeffers registered both visc numbers to be within parameters to still be qualified as a 40 weight
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Last edited by gsleve; 06-13-2003 at 11:17 AM.
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Old 06-13-2003, 11:26 AM   #2
gsleve
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Member#: 12132
Join Date: Nov 2001
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Personally what this analysis does is speaks volumes that a well formated pmco oil can handle extended drains without any deteriment or harm to the engine, this being substantiated through a UOA, this also allows me to trend this oil and allow me to pick a cut off time that is comfortable without any harm to the motor.

So changing an oil out at 5k is unnecessary or even the 3k mentality is out the door. Bear in mind this is a synth blend not even a full polyol or ester synthetic oil given that if it were we could possibly extend the oil out even further
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