---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Mon 07/12/10: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:51 AM - Re: 912ULS Recommended Oil (Thom Riddle) 2. 07:38 AM - Re: Re: 912ULS Recommended Oil (Noel Loveys) 3. 08:07 AM - Re: 912ULS Recommended Oil (Thom Riddle) 4. 11:36 AM - Re: 912ULS Recommended Oil (Roger Lee) ________________________________ Message 1 _____________________________________ Time: 03:51:13 AM PST US Subject: RotaxEngines-List: Re: 912ULS Recommended Oil From: "Thom Riddle" Roger, MIneral oils adhere better to the metal surfaces than synthetics when idle. This better protects the surfaces from exposure to the elements that can cause corrosion during non-operating periods. -------- Thom Riddle Buffalo, NY (9G0) Kolb Slingshot SS-021 Jabiru 2200A #1574 Tennessee Prop 64x32 If life gives you limes, make Margaritas. - Jimmy Buffet Read this topic online here: http://forums.matronics.com/viewtopic.php?p=304565#304565 ________________________________ Message 2 _____________________________________ Time: 07:38:09 AM PST US From: "Noel Loveys" Subject: RE: RotaxEngines-List: Re: 912ULS Recommended Oil Synthetic oils are super slippery and from what I've read they just don't do the job of protecting metal parts if left for a period of time. Mineral oils are much more protective. So if a plane is being flown almost every day no doubt about it synthetic is the way to go. If though you only fly say once a month then mineral will be better. Either way with two stroke engines use low ash oils and with the 912 series use a good quality motorcycle oil. You are right about mineral oil becoming acidic and for some reason mechanics say that it's better in the differential of the car to have older seasoned oil in it. The manual on my father's old '64 Jeep said to change the oil every 20K miles... I think. That is the reason why I change my oil as soon as the car comes out of storage for the winter. As for which oil is best... That's like asking whose wife is best. Noel -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Roger Lee Sent: July 11, 2010 11:11 AM Subject: RotaxEngines-List: Re: 912ULS Recommended Oil Howdy Noel, Why would your prefer the mineral oil for infrequent type flying over synthetic? I'm trying to pull out of memory about mineral oil after months of just sitting is more likely to become more acidic than a synthetic. I can't remember the direct info though. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=304459#304459 ________________________________ Message 3 _____________________________________ Time: 08:07:46 AM PST US Subject: RotaxEngines-List: Re: 912ULS Recommended Oil From: "Thom Riddle" I don't know if old mineral oil becomes acidic or not. Perhaps the stuff it picks up from circulating in the engine may become acidic, but I'm skeptical that the oil itself does. Following is an excerpt from WIKIPEDIA entry on Mineral Oil (I know it may not be authoritative, but I think this one is based on the bibliography). WIKI EXCERPT Preservative Since it does not absorb atmospheric moisture, mineral oil is useful as a protective coating or bath for water-sensitive materials. Alkali metals like lithium are often submerged in mineral oil for storage or transportation. Mineral oil is also often used as a coating on metal tools and weapons, knives in particular, as a way to inhibit oxidation. The Japanese Nihonto swords, for example, are traditionally coated in Choji oil which consists of 99% mineral oil and 1% oil of cloves. The use of oil of cloves is sometimes explained as a means of differentiating sword oil from cooking oil to prevent accidental ingestion, but may also be purely aesthetic. My Opinion If it is used as a long term storage coating then it is unlikely that the mineral oil is becoming acidic. I would bet that an engine run the same amount of time on mineral oil and synthetic oil then let to sit for an extended period would exhibit similar acidic properties, whatever they are and whatever the source but this is just my guess. I've not seen any tests comparing this particular quality between mineral oil and synthetic. As others have noted, changing the oil before long term storage is a very good idea. Aeroshell's preservative oil is 40 wt mineral oil (80 in Aeroshell terms) and that is what I use for winter preservation oil on Rotax, Jabiru, and Lycoming engines. -------- Thom Riddle Buffalo, NY (9G0) Kolb Slingshot SS-021 Jabiru 2200A #1574 Tennessee Prop 64x32 If life gives you limes, make Margaritas. - Jimmy Buffet Read this topic online here: http://forums.matronics.com/viewtopic.php?p=304586#304586 ________________________________ Message 4 _____________________________________ Time: 11:36:00 AM PST US Subject: RotaxEngines-List: Re: 912ULS Recommended Oil From: "Roger Lee" Thanks Noel and Thom for the info. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center 520-574-1080 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=304609#304609 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.