The conventional wisdom is to begin using a ashless dispersant oil such as Aeroshell 80 or 100 once oil consumption has stabilized. Ask your mechanic or engine rebuilder about this. Ashless dispersant oil does have a cleansing effect that straight mineral oil does not have. I use Aeroshell 80 (40 wt) as recommended by the owners handbook and it seems to do fine. Shell Oil Company put out a video on oil which is excellent and explains how oil works, etc. If you can find a copy it is worthwhile viewing.
I also use TCP since I purchased my Coupe in 1996 and so far I have had no valve stem problems or fouling problems. It does seem to work well and is FAA approved. Embry and Riddle did a study with their fleet of C172s over a 10,000 hour period and found that it did reduce sludge and deposits and maintenance costs. There have been no studies on Marvel Mystery Oil that I am aware of. From what I have read it does not seem to harm the engine when added to the oil, but I do not use it. However, keep in mind it is not an FAA approved substance for aircraft engines. I am sure you will find a lot of people who swear by it but I am not one to add stuff to my oil unless there is some solid scientific evidence (other than random testimonials) that the stuff really does some good. I recommend obtaining a copy of a copy of "Fuel & Oil Systems" from the publishers of Light Plane Maintenance Magazine. The subject of TCP and Marvel Mystery Oil is discussed in depth there. Regards Charles McKinnie N3050G, GEU -----Original Message----- From: Tom Laird-McConnell <[EMAIL PROTECTED]> To: Ercoupe list <[EMAIL PROTECTED]> Date: Friday, April 30, 1999 11:18 PM Subject: FW: The subition of 80L.L. > > >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >Sent: Friday, April 30, 1999 7:34 PM >To: [EMAIL PROTECTED] >Subject: The subition of 80L.L. > > > Fellow coupers, >I have a 46' 415D w/C85 and 50 hrs. on a new set of cylinders.I have been >using Shell mineral oil since the overhaul for break in. I have changed the >oil 3 times, the first after 10 hours. I have an EL RENO filter, at present >the usage is 6 to 7 hrs./qt. The first 2 hr. the temp. was at red line but >has decreased to 350 F. Oil temp. was also at red line but has settled >dwn.to >180F.to 200F. There is very little vibration and it pulls through with high >compression on all fours, it starts with one or two revs. Climb rate >600ft/min. and G. P. S. air speed@ 108mph cruise w/ a passenger. >California EPA has outlawed all fuel tanks without double casignings and it >cost about $300,000.00 to replace the one in Corona. Corona has 100L.L. but >it will take 3-6 mounths.to supply 80L.L.The nearest 80 is 50 miles >away.When >flying to Mesa,Az.I had to fuel up with 30 gal. of 100L.L.. I use T. C. P. >additive and 1oz./gal Mystery Oil to get me to the next 80L.L.. The >carburetor float valve has been changed to S.S.w / Teflon seal and the float >has been weighted via Unvair. > My question is two fold > 1-Should I change type of oil and what >kind? > 2-Will T. C. P. stop lead foul and will >Mystery Oil keep the > valve stems from sticking.Is There >harm >using 100L.L.? > All help and advice will be appreciated in advance. > Safe Flying, > 99089er Charlie > >
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