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tennesseect

Can we mix orange and green antifreeze?

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In a pinch yes. In the old days no. If you can avoid it which is extremely easy don't. Green is standard life and orange is extended life. Use distilled water if you don't have the right type to top off reservoir. The system only takes about 3/4 gal. and changing coolant is easy and only takes about 5 minutes. Better to just change the whole thing at times. 

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Walmart has Dexcool on the shelf, I don't care for "universal / equivalent" type products, spend a few bucks more and buy the name brand.  Probably ok using the generic stuff, but to Roger's point so little is needed it's not a big deal.

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It's what they use in Europe. Rotax says use a 50/50 mix and the big majority in the US use DexCool as it was recommended and is rated as extended life. So the green Prestone would get replaced every 2-3 years and the orange extended life to the 5 year rubber change.

The blue BMW stuff is a bit harder to come by and I don't know its compatibility with other coolants or life. 

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3 hours ago, Roger Lee said:

Rotax says use a 50/50 mix

Right, 50/50 with the BMW coolant.  I had to drive 45 minutes to get it.  Whatever works and certainly you would know.  Given the Tucson temps, you have a very good idea of which coolant works.

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Be careful if you are intending to add anything to "Blue" coolant!  You should read the Rotax Fluids Service Instruction that was just revised (attachedRotax fluids service instruction.pdf).  According to Rotax, the blue stuff should be "Waterless Coolant" aka Evans in the USA and Aero Cool 180 in Europe.  You should never add water or water based coolants (green or orange) to the waterless blue stuff. See the Rotax Service Instruction.

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On 12/12/2020 at 12:36 PM, tennesseect said:

Is it permissible to mix orange and green antifreeze?  I see Rotax has approved several types but can I just buy by color at the auto parts store?

Your airplane has Dexcool 50/50 pre mix in it.

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MEH,

My blue BMW motorcycle coolant is mixed 1:1 with distilled water as per FD USA... I run a 912i... I believe the Rotax manual supports FD’s recommendation.  Thanks for sending the Rotax info.

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My apologies.  The waterless Evans (in the blue jug) approved by Rotax, is not to be confused with the 50/50 BMW blue stuff approved by FD. 

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