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"They definitely "cling" to the exposed parts better and provide better protection against corrosion than straight weight oils - an important factor for planes that tend to sit." Tom. The opposite is true. The problem is that of the multiviscose oil is stripping itself off the parts because these oils are basically thinner weight stock oils with a lot of additives. Starting with a low viscosity oil is desired, it assures a good oil transfer to all lubrication points on cold starts. A negative effect is that multi viscose oils can't cling on metals as let's say a 50 weight oil would. At cold temps, the 50 weight oil is a thick mass, that clings to the metal much better just look at the dip sticks. For planes that are flown only ones every few months, the multi viscose oil used to have enough time to completely drip off the metal parts inviting corrosion. Especially true for the fully synthetic aviation oils of the past. This is a known problem to the oil manufacturers. They developed additives that makes the oil stick better to the metal. One way is to mix the oil to make it half-synthetic. It basically adds the advantages of the straight weight mineral oils . And good marketers as they are, they market the disadvantage to their advantage. Funny thing is that as so often this kind of marketing is distorting the truth that much that the better (even less priced) stuff is being discarded in favor of the marketing message. More here : http://www.eaa49.av.org/techart/str_oil.htm An excerpt here: "Until now, we've always believed that to the extent multigrades might not be protecting camshafts as well as straight-weight oils, it might simply be because multigrades which are thinner at ambient temperatures than most straight-weight oils simply run off of the parts quicker in an inactive engine, leaving steel parts exposed to the elements. However, SAE 951035 suggests that even in an active, running engine, straight-weight oils protect against wear better than multigrades. (Remember, in the SAE study, actual wear rates were measured while the engine was running.)" I don't want to lecture anyone. I also think that at ambient temperatures of around freezing (Winter) a multi grade oil is beneficial. Come to your own conclusions, but see the facts. And don't ask the used car dealer for his opinion on the car he wants to sell you. Hartmut ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Friday, November 24, 2006 2:21 AM Subject: Re: [COUPERS-TECH] Pre heating > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > > AVBLEND is probably worth it too. (It was FAA approved in 1997, but it > has been around a lot longer and was tested/proven in helicopter engines > which tend to take more abuse than in fixed-wing aircraft.) > > I'm a firm believer in the multi-viscosity/multi-weight oils! They > definitely "cling" to the exposed parts better and provide better > protection against corrosion than straight weight oils - an important > factor for planes that tend to sit. > > Tom > > > > > > ----[Please read http://ercoupers.com/disclaimer.htm before following any > > advice in this forum.]---- > > > > > > AV Blend (Linkite) has been out for a while, as an FAA approved oil > > additive. I reviewed their claims and became convinced enough to spend my > > hard earned money on it, at every oil change. > > Eliacim > > N87071 > > > > ----- Original Message ----- > > From: <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Thursday, November 23, 2006 10:00 AM > > Subject: Re: [COUPERS-TECH] Pre heating > > > > > >> ----[Please read http://ercoupers.com/disclaimer.htm before following > >> any > >> advice in this forum.]---- > >> > >> > >> I think the general concensus amongst us mechanics is to pre-heat below > >> about +/- 40 degrees or so if at all possible. > >> > >> When I was living up in Alaska, in addition to pre-heating the engine, > >> some of the guys would drain the oil - usually when they finished flying > >> - > >> and heat it in their homes (or hangars, or tents, or wherever). The > >> potential is there for forgetting to put the oil back in, but I didn't > >> hear of anyone doing so. > >> > >> On another note regarding engines, CamGuard seems to be showing a lot of > >> promise as an oil additive. > >> > >> There's a pretty good article titled "Oils and Oil Additives" by Jim > >> Cavanagh in the May 2006 issue of PIPERS magazine. www.piperowner.org > >> > >> Tom Graziano > >> A&P, I.A. > >> > >> > >> > >>> ----[Please read http://ercoupers.com/disclaimer.htm before following > >> any > >>> advice in this forum.]---- > >>> > >>> > >>> Hello to all, > >>> What does everyone think about preheating the engines in our coupes??? > >> Winter is almost here in the northeast and my poor coupe is outside tied > >> down. > >>> Bill > >>> N2367H > >>> > >>> ============================================================================ == > >> To leave this forum go to: http://ercoupers.com/lists.htm > >>> > >>> > >>> > >> > >> > >> > >> > >> ============================================================================ == > >> To leave this forum go to: http://ercoupers.com/lists.htm > >> > >> > >> > >> > >> > > > > ============================================================================ == > > To leave this forum go to: http://ercoupers.com/lists.htm > > > > > > > > > > > ============================================================================ == > To leave this forum go to: http://ercoupers.com/lists.htm > > > > ============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm
