|06-13-2003, 12:10 PM||#1|
Join Date: Nov 2001
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.
Cu___3 ________ 4
Additives read as follows below
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 12:17 PM.
|06-13-2003, 12:26 PM||#2|
Join Date: Nov 2001
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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