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Thread: Old compressor syntetic oil after mineral oil

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    RBW Member CCRWannabe123 is an unknown quantity at this point CCRWannabe123's Avatar
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    Old compressor syntetic oil after mineral oil

    Hi everyone,

    My freind has a specific situation...he bought a Bauer compressor from a guy who has been putting Syntetic oil in it for the last 200 hours of use.

    However the compressor is from 1980s.

    Another friend says that it's strange because Syntetic oils were not used / invented back then and that originally the compressor for the first 500-1000 hours was for sure used with minereal oil.

    Now, we all know that it's not good to mix or use one after the other...however now it's too late, and it's already been there.

    Should he continue using Syntetic now and is it all ok or should he go back to Mineral?

    Does anyone have experience with this?


    Thnx!

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    Compressor Guy rcontrera is an unknown quantity at this point rcontrera's Avatar
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    Re: Old compressor syntetic oil after mineral oil

    The reason you don't just shift over to synthetic from mineral oil is that, in many cases, carbon buildup from cooking the mineral oil will be softened up and/or break loose. And that carbon can jam open valves.



    You already have 200 hours on the synthetic so you should be fine.

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    RBW Member CCRWannabe123 is an unknown quantity at this point CCRWannabe123's Avatar
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    Re: Old compressor syntetic oil after mineral oil

    Quote Originally Posted by rcontrera  View Original Post
    The reason you don't just shift over to synthetic from mineral oil is that, in many cases, carbon buildup from cooking the mineral oil will be softened up and/or break loose. And that carbon can jam open valves.



    You already have 200 hours on the synthetic so you should be fine.
    Thank you very much!

    This means to continue using the Syntetic than if there are no current issues with the compressor I suppose (just to confirm)?


    Is there a way to recognize visually when you see the oil from the compressor that it is Syntetic or Mineral...when bleeding it after usage?
    Last edited by CCRWannabe123; 5th February 2019 at 21:56. Reason: better explained the question

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    RBW Member CCRWannabe123 is an unknown quantity at this point CCRWannabe123's Avatar
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    Re: Old compressor syntetic oil after mineral oil

    Quote Originally Posted by CCRWannabe123  View Original Post
    Thank you very much!

    This means to continue using the Syntetic than if there are no current issues with the compressor I suppose (just to confirm)?


    Is there a way to recognize visually when you see the oil from the compressor that it is Syntetic or Mineral...when bleeding it after usage?

    I'm asking because the second question because the same friend / dive club has just bought another very old Utilus compressor from Bauer, just to try to recognize what they were pouring previously inside (the guy who they are buying from is not 100% sure and compressor looks in good condition).

  5. #5
    RBW Member michael-fisch will become famous soon enough michael-fisch will become famous soon enough michael-fisch will become famous soon enough michael-fisch's Avatar
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    Re: Old compressor syntetic oil after mineral oil

    Quote Originally Posted by CCRWannabe123  View Original Post
    I'm asking because the second question because the same friend / dive club has just bought another very old Utilus compressor from Bauer, just to try to recognize what they were pouring previously inside (the guy who they are buying from is not 100% sure and compressor looks in good condition).

    The proper procedure when switching to synthetic oil is to drain all to old oil out and refill with synthetic oil.
    Then run the compressor for around 5 hours and drain that oil. Refill with synthetic and now run it for around 25 hours. Drain that oil and refill with synthetic oil and now run it for 1/2 the reccomended oil change interval for normal oil.
    Now after the next oil change you can finally use the standard synthetic oil change intervalls, which at least on Bauers are twice as long as the intervals for normal oil.


    Michael

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    RBW Member CCRWannabe123 is an unknown quantity at this point CCRWannabe123's Avatar
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    Re: Old compressor syntetic oil after mineral oil

    Thnx for the information!

    Is there any way when visually seeing two used oils to know by density, texture or anything else which is Mineral and which is Syntetic?



    Thnx!

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    RBW Member michael-fisch will become famous soon enough michael-fisch will become famous soon enough michael-fisch will become famous soon enough michael-fisch's Avatar
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    Re: Old compressor syntetic oil after mineral oil

    Quote Originally Posted by CCRWannabe123  View Original Post
    Thnx for the information!

    Is there any way when visually seeing two used oils to know by density, texture or anything else which is Mineral and which is Syntetic?



    Thnx!

    I'm sure that people working in oil analysis labs have the ability, I sure don't. Got no idea what an accurate oil analysis costs if nothing is known about the oil but it could endup costing way more than a 20L can of whatever synthetic oil you would buy for your compressor. If you already know what oil it is, a professional analysis shouldn't cost too much, since it's done all the time for construction machinery.

    Since whatever you put into the compressor is going to be different than whats in it, the only safe way is to take care and do lots of oil changes in the beginning.


    Michael

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    RBW Member CCRWannabe123 is an unknown quantity at this point CCRWannabe123's Avatar
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    Re: Old compressor syntetic oil after mineral oil

    Quote Originally Posted by michael-fisch  View Original Post
    I'm sure that people working in oil analysis labs have the ability, I sure don't. Got no idea what an accurate oil analysis costs if nothing is known about the oil but it could endup costing way more than a 20L can of whatever synthetic oil you would buy for your compressor. If you already know what oil it is, a professional analysis shouldn't cost too much, since it's done all the time for construction machinery.

    Since whatever you put into the compressor is going to be different than whats in it, the only safe way is to take care and do lots of oil changes in the beginning.


    Michael
    Very clear! Thank you very much for advice! :)

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