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At 6000 feet MSL, 95 degrees F max continuous my oil temperature is at 250 F using Aeroshell plus 4, and CHT at 250 with Dexcool 50/50. This is within limits but higher than I want.

I was told by a very reliable source who has a similar installation that if I add AMSOIL Coolant boost to my 50/50 Dexcool sytem, I will get 10 to 10 degrees drop in coolant temperature.

I was also told that if I go to the AmsOil motorcycle 10/40 fully synthetic oil I will get a 20 degree drop in oil temperature and that the AmsOil is better overall when running only auto/MOGAS. I do not use any 100LL avgas

Any words of wisdom or experience with these two cooling enhancements?
  • Re: 912S simple cooling enhancements for hot weather

    by » 10 years ago


    Follow up question. If I am going to change from Aeroshel sport plus 4 to AmsOil motorcycle oil, can you just drain the aeroshell and add the AmsOil? I know there will be some Aeroshell left and there will be a little mixing. This OK?

  • Re: 912S simple cooling enhancements for hot weather

    by » 10 years ago


    Hi Paul,

    I have used both of these oils. I still use Amsoil. They should be compatible, but if you want to error on a safer side. Drain the oil tank, drain the oil cooler, change the oil filter and then do an oil purge. I have not had any ill effects from just swapping them at a regular oil change, but some may not be comfortable with that.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: 912S simple cooling enhancements for hot weather

    by » 10 years ago


    I did both, add AMSOIL Coolant boost to my 50/50 Dexcool sytem, and changed to Amsoil motorcycle 10/40 fully synthetic oil.

    I ended up getting a 10 degree drop in both after significant testing. Not the 20 but a significant improvement.

  • Re: 912S simple cooling enhancements for hot weather

    by » 10 years ago


    Those types of myths have been around for a long time. The biggest help to cooling is making sure you have good inlet air flow over the coolers, make sure you have no tight bends in hose. A reduced Radius hose in the coolant and or oil hose will cause a 20-30 F increase. Many have put springs in hoses to keep them open. I know of a few LSA MFG's that use springs in hoses. I just had one with a temp that was normally around 230f on climb and the last couple of flights the oil temp went to 250f. Inserted a spring into the oil hose that had a pretty good bend and the climb oil temps went back to 220-230f max. A hose re-route can help, but sometimes isn't possible.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


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