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Thread: Used Oil Analysis from my 03 STI

  1. #1
    Member Alan2911's Avatar
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    Used Oil Analysis from my 03 STI

    So I know the engine oil topic has been debated very thoroughly. I have never really found a lot of empirical data on the subject.

    I recently got a 2003 STI. Take into account that there is a fairly "new" 2.5L engine in it, ~20,000km. Modifications are forged pistons, 3" turbo back exhaust, water-meth injection, tune. Everything else is "stock".
    The car was bought running Amsoil 20W50 synthetic engine oil. Amsoil used from the engines start i believe... I decided to do a used oil analysis of the engine oil to see how the oil was holding up, but mostly out of shear curiosity.

    My plan is to have a UOA done of the first and second Amsoil samples, and then first and second Royal Purple samples. Same grade oil 20W50.

    The UOA shows the following topics which we could use to kind of compare the two:
    - Wear Metals
    - Contaminants
    - Additives
    - ASTM D445 (viscosity of oil at 100 degrees C)
    - ASTM D664-04 (the measure of the acidity through a method of titration I believe)
    - ASTM E2412
    - Crackle

    I understand that there can be other manipulated variables that could possibly affect the UOA of the various samples, but I still think it would be interesting to see the comparison if nothing else.

    This is UOA 1, Amsoil 20W50 Synthetic attached as a picture. I will continue the thread as I have the following UOAs done. I have a long commute so this should lag around too long. Keeping the same change intervals for each sample to try and keep as much constant as possible between them.
    Attached Images Attached Images

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    STi_Kid (02-08-2013)

  3. #2
    The Power Happy Hooligan STi_Kid's Avatar
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    Seems to be duplicate threads. So I deleted the other.
    The only difference was a logo on the top of images.
    STi KiD,
    Crossing the line of bravery to insanity!

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  4. #3
    TSOC bugeye Mafia Chung's Avatar
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    well done!
    Cheap and fast won't be reliable. Cheap and reliable won't be fast. Reliable and fast won't be cheap.

  5. #4
    The Power Happy Hooligan STi_Kid's Avatar
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    Now that I understand it better, good write up haha.
    STi KiD,
    Crossing the line of bravery to insanity!

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