I know a old t-craft with a 65 h.p.cont. that is in real good shape , and has been on penzoil around ten years..Ken C, -----Original Message----- From: Bob U. <[EMAIL PROTECTED]> To: Coupers <[EMAIL PROTECTED]> Date: Wednesday, August 04, 1999 8:37 PM Subject: Re: Synthetic oils
>Mi Vida Loca wrote: >> >> I can't make any comments about Amsoil but I can tell you about Mobil 1, and not the propaganda spread around to bolster legal claims. I've been flying Mobil 1 for over 8 years in my C-90 and a friend has been using it for the same period in his C-85. We have a combined total of over 1800 hrs in those 8+ years. In that period of time neither has experienced a single valve sticking which had been a problem previously. One of these engines one was low time (300hrs) and the other (1400hrsTT 250STOH) at the time the change to Mobil 1 was made. Oil changes (?) have been 200 hrs along with filter change. Since neither engine can go 200 hrs without adding several quarts of oil you cannot really say there is 200 hrs on the oil, just the filter(El Reno filter kit). >> > >I am no enemy of true synthetics or blends of such, but they do have >their place and need to be understood fully. >They are NOT an automatic replacement, panacea, for any and all >conditions or environments or applications. >Superior film strength is their forte without question at elevated >temperatures especially. TURBINES come to mind? >This certainly allows extended time between oil changes with no harm, >PROVIDED unacceptable levels of contaminants are not accruing during >this extended interval. >Not all contaminants can be handled adequately with a mechanical >filter... not even a magic Amsoil filter. Solids can me filtered. >Harmful liquids cannot. > >ONE, just ONE of the by-products of combustion is H2S04... especially >when an engine is used in 'stop and go' service. >Like short trips around the pattern or flying down the road a piece and >back home. >Fleet service is just the opposite of such. >What is H2S04? >It is created from moisture (water) and sulfur compounds combine from >burning fossil fuel. >Your Ercoupe battery works only because of H2S04. >Yes, plain ol' battery ACID.... >And battery acid loves engine bearings. >Modern oils, synthetic and otherwise contain NEUTRALIZERS, anti-foamers, >anti-oxidizers and all kinds of CHEMICAL wizardry that would make a full >blown Ph.D. chemist blush here. > >Even petroleum based oil do NOT wear out. >For the most part it gets contaminated BEYOND SAFE LIMITS with stuff >besides solids that can be held in suspension and/or filtered out. >Ditto for synthetics in OUR APPLICATION. >That is why the auto manufacturers want synthetics drained at the same >intervals as regular oil. >With synthetics costing so much, they are not a financially viable >alternative under these circumstances. > >WE ARE NOT FLYING TURBINES. That is a whole 'nuther application with its >own unique parameters. > >This is not a flame against synthetics, as you can see. >There just happens to be a lot more than meets the eye going on with >lubrication materials. > >> These 2 engines are unbelievably clean inside, unlike the Amsoil when we switched we just changed oil and filter and cleaned the oil screen (yes we left them in when we installed the filter kit) at 5 hours (no flush) and got tons of crud and sludge out. It was like giving the engines a laxative!!! We ran 10 hours on the next change and got substantially less crud. The third change was at 50 hours and was clean. The higher time engine developed a leak of the front seal which when changed was found to be very brittle due to age. The leak was obviously due to loosing the sludge that was acting as a seal. >> > >I had 3 Pawnees with a combined 9000 hours that used only Aeroshell 100 >for their entire lives. >At TBO of 2000 hours we tore them down just because human life and peace >of mind were of primary importance. >NONE EVER HAD A BIT OF SLUDGE OR MEASURABLE WEAR. > >So, contrary to some opinions and urban legends, there is no metal to >metal contact using petroleum based oils, either. >Engines that use synthetics fail too. >Most failures are not due to the type of oil in the crankcase. >Bearing failures today are most uncommon. >Other COMPLEX factors do come into play. >Let's not kid ourselves. > >> Both engines run mainly on Mogas except for X-countries when only 100LL is available. When Mobil 1 was originally being tested for certification it was used by a very large flying school that flys 150's to twins. Their experience was negligible wear at TBO on the tear down. They were however flying 100LL but experienced none of the claimed sludge or lead problems, but they were starting on new engines. >> >> I've been using Mobil 1 in my cars since it came out, 165,000 miles on one 115,000 on another and 130,000+ on the current. None have ever experienced an engine problem with the exception of one car which had an oil pump go south at 100,000 miles. A new pump and away it went for another 15,000 miles before it suffered a cosmetic blemish, got it's nose rearranged. >> > >I have 171,000 miles on a 91 Mazda that has never seen synthetics other >than an abusive teenager that might be called a synthetic human given >the way he treats machinery. Only the belts, clutch, ignition wires, >spark plugs and hoses have been replaced over time. >The hydraulic lifters never rattle. It runs as strong as new. This is >just one anecdotal story balanced against another. >Many petroleum based vehicles make 200k -300k readily. OIL CHANGES SEEM >TO BE THE MAJOR MITIGATING FACTOR. So, no big deal. >One can change oil on a 3 to 1 ratio dollar-wise, so I guess one pays >their money and takes their chances. > >> An interesting side note: In a flight a few years ago one Couper on a X-country who was experiencing *very* high oil temps noticed that when he pulled the dipstick after landing the oil poured off leaving almost no film on the dipstick, the other who was using Mobil 1 found his dipstick remained well coated with oil when he pulled his. Their oil temps were within 5 degrees throughout the flight. >> > >If the oil film, synthetic or otherwise ever quits an engine, even for >an instant..... >It's curtain time! >Can you say..... MAJOR DAMAGE. > >The rest of the post has been eliminated for brevity. > > >Bob - gimmee the most bang for the buck - Urban >
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