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Oil / Oil filter recomendation for 912UL

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paul perry

Joined: 11 Jun 2008
Posts: 36

Posted: Sat Aug 30, 2008 12:47 pm Post subject: Oil / Oil filter recomendation for 912UL

Ok, I've read several posts/replies on oils and filters both on this list as well as the rotax list, but most are 1-2 yrs old. Anybody have experience with the AV-9 oil from California Power Systems? I am using 100LL and this seems to be a good choice and reasonably priced, but would like some experienced input. The owner/builder had been using a Valvoline semi-synthetic 10-40, but I'm worried about it not doing the job for the gearbox. As far as the filter, from what I can tell from the posts there seems to be quite an argument whether or not the genuine rotax filter is worth the extra money rather than a top quality purolator/K&N/NAPA, but again would like to hear from anybody that has actually had bad results from the non-rotax filters or at least knows first hand of problems.  Thanks in advance to those who take the time to respond, Paul P.

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vetdrem

Joined: 20 Nov 2007
Posts: 62

Posted: Sat Aug 30, 2008 1:17 pm Post subject: Re: Oil / Oil filter recomendation for 912UL

It's my understanding that the NON-rotax filters have relief pressures lower than the normal operating pressure of the 912UL.  If that is in fact true, then the oil would bypass the filter completely.  This is hear-say, but  I couldn't bring myself to take the chance.  I bit the bullet and bought rotax filters. I wish someone could test both fliter bypass pressures to see if it there is really a difference.



As for the oil, I am told that when using 100LL you need to stick with a semi synthetic oil because the full synthetic oils don't stand up to the lead as well.  I use 20-W50 semi-sythetic motorcyle oil designed for four stroke engines.  The havoline brand has worked well for me.  Just be sure that the oil is for four stroke motorcycles because it will have the additive package to take care of the gears.

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peteohms

Joined: 31 Oct 2007
Posts: 224
Location: Leander, TX

Posted: Sat Aug 30, 2008 2:25 pm Post subject: Oil / Oil filter recomendation for 912UL

Here is a good thread on the issue.  I use a NAPA because it fits and the 

STP won't with carb heat.  Read this:



http://forums.matronics.com/viewtopic.php?t 821&highlight=pl10241



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_________________
Pete
Leander, TX
Kitfox III, 912ul, Grove

lcfitt(at)sbcglobal.net
Guest

Posted: Sun Aug 31, 2008 5:18 pm Post subject: Oil / Oil filter recomendation for 912UL

I used AV-9 for a while.  I switched to Pennzoil Motorcycl Motor oil 

because, as I recall, Rotax had done some research on foaming of the various 

oils and had not to that point tested the AV-9.  I think I remember that the 

new dipstick introduced at that time (that would give a time frame in the 

Service Letters), which put the full mark a bit higher on the stick, was a 

result of the foaming issue.  It seems that the folks trying to have us all 

live forever found something that would take a minute or two off our lives 

in the antifoaming additives and made it a no no.  Without the additive, 

Rotax got a bit anxious and went over the recommended list again. I know of 

no current info.



Lowell



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JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Wed Sep 03, 2008 6:47 am Post subject: Re: Oil / Oil filter recomendation for 912UL

The Rotax Oil filter is a poor oil filter      It has a small paper element that does not have good filtering efficiency...   The Purolator oil filter is the best, followed by the Mobil 1.  Roger Lee did a lot of research on this, and I checked out his information and found it to be good.



As far as the bypass pressure, it is true that the Rotax bypass pressure is slightly different,  the two filters I mentioned have a bypass pressure of 12 PSI while the Rotax filter is 13 PSI...  One PSI is at that pressure is less than 8 % difference, in other words, the bypass pressure is not enough to make a darn bit of difference.



You can read this information on oil filters in this post, my research is posted towards the bottom of the thread.



http://forums.matronics.com/viewtopic.php?t=20821



Mike

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_________________
"NO FEAR" - If you have no fear you did not go as fast as you could have !!!

Kolb MK-III Xtra, 912-S

paul perry

Joined: 11 Jun 2008
Posts: 36

Posted: Wed Sep 03, 2008 4:26 pm Post subject: Re: Oil / Oil filter recomendation for 912UL

Thanks Mike, (and Roger also for his research), based on this information  I believe I'll try the Purolator filter  and a 4 cycle motorcycle oil rather than having to order the rotax filter and AV-9 or Aerosport oil. Thanks again to everyone who posted an opinion, Paul P.

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