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Use of full synthetic oil with Avgas 100LL

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Roland

Joined: 30 Nov 2009
Posts: 334
Location: EDLE

Posted: Thu May 01, 2014 10:59 pm Post subject: Use of full synthetic oil with Avgas 100LL

Hi friends,



my Europa is equipped with the Rotax 914 and I sometimes see oil temperatures beyond 120°C, especially in summer in the climb to high altitudes. 



I understand – and this is also what Rotax releases – that full synthetic motorcycle oil (e. g. Shell Advance Ultra 4) is best for the engine regulary exceeding 120°C, PROVIDED THAT only unleaded fuel is used. 

On very rare occasions (about 3-5%) I have to refuel with 100LL. Can I then only use semi synthetic oil?



Any comments much appreciated.



Regards

Roland

PH-ZTI

XS Trigear 914

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tennant

Joined: 19 Apr 2011
Posts: 121

Posted: Sun May 04, 2014 11:27 pm Post subject: Re: Use of full synthetic oil with Avgas 100LL

Hi Roland,



I see that no one is sticking his neck out on this one!!



Personally I would not worry about a couple of % of Avgas. 



Barry

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Barry Tennant
D-EHBT
At EDLM - Germany

Roland

Joined: 30 Nov 2009
Posts: 334
Location: EDLE

Posted: Mon May 05, 2014 12:10 am Post subject: Re: Use of full synthetic oil with Avgas 100LL

Good morning Barry,



thanks for sharing your personal opinion since in fact this was what I'm looking for as the Rotax releases are clear in stating no full synthetic oil with Avgas (and of course you won't get any other statement from them). But apparently there is no one using full synth with even very little Avgas (or at least no one is willing to post it here, what I would also understand). I didn't decide yet, which oil to use next. Maybe semi synthetic until UL 91 or another lead free Avgas is available on a broad level. 



I modified my cooling system, so that I hopefully won't see oil temps beyond 120°C too often sometime in the future (when I'm finally flying again).



Regards

Roland

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Roland

Joined: 30 Nov 2009
Posts: 334
Location: EDLE

Posted: Mon May 05, 2014 6:31 am Post subject: Re: Use of full synthetic oil with Avgas 100LL

I also found this one, although it's no official Rotax document.



http://www.rotaxservice.com/rotax_tips/rotax_feed4.htm



"Users running MOSTLY unleaded fuel can opt for full-synthetic or semi-synthetic oils."



....still searching for infos on that in the www...

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tennant

Joined: 19 Apr 2011
Posts: 121

Posted: Mon May 05, 2014 7:04 am Post subject: Re: Use of full synthetic oil with Avgas 100LL

Roland,



I use Shell AX7 (semi synthetic) and worry more about my oil temps!!

I always use Avgas if the ambient temps are likely to be (30deg C or +) or (0deg C or -). Otherwise super.



Barry

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Barry Tennant
D-EHBT
At EDLM - Germany

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