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I plan on switching to XPS but I just recently did an oil change with Aeroshell.  Can XPS Aircraft oil be used to top off a 912iS with Aeroshell Sport Plus 4 in it until the next oil change?  I asked one service center and they said yes.  I asked another service center and they said not only no but the old oil needs to be flushed with a quick change.  What is the official Rotax position?

  • Re: Topping off with XPS in 912iS

    by » 3 weeks ago


    For what it's worth:

    XPS is a full synthetic oil

    Aeroshell Sport Plus 4 is a semi synthetic oil.

    Personally I would not combine them.

    As for changing from Plus 4 to XPS -Cant see the point in a "flush" - I would do a usual oil/filter change, just use XPS in place of Plus 4 and then a second oil change, say 5-10 hrs later, again with XPS.

    Rational -

    Do not mix oils of diffrent chemical makeup.

    Flush may remove most of the old Plus 4 oil however some flush will remain to contaminate new XPS

    By doing an oi/filter change you will be removing almost all the Plus 4. The small amount that remains, will be highly diluted by the replacement XPS.

    Interim oil/filter change at 5-10 hrs, using XPS, will further dilute the already small amount of Plus 4

    Alternative: Drain all Plus 4 oil from system. Replace with XPS & do a full oil system purge. Future service intervals as per Rotax recommended.


  • Re: Topping off with XPS in 912iS

    by » 3 weeks ago


    Sean is correct. 

    There is a procedure in the MML that works.  I would follow up with an additional oil change at 25 hours after to be sure all traces of the offending oil are gone.  

    The XPS must be used for the type 916.  We have already heard about some engines with the Shell sliping the overload clutch on takeoff.  While it cant be sure that is the issue Rotax has advised any engines with slipping and the Sport Plus 4 in a 916 will not be covered.  

    Cheers

    40512_2_oil purge for wrong oil .jpg (You do not have access to download this file.)

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