Hi all

With all the talk on this stuff I ran a search on yahoo and found the following in this digest

http://pulsar.westmont.edu/aeronca/digest/engine/

"The ingredients were analyzed a few years ago in Light Plane Maintenance
(and I've seen it somewhere else too). My recollection is that it is
primarily a lightweight oil, solvents and TCP(same stuff as in Alcor).
TCP tri-chloral phosphate(sp?) is a lead scavenger. I used to use Alcor
religiously in my O-320 powered Pacer when I had to put 100LL in it.
Really useful in engines that tend to get lead fouled plugs. The TCP
and solvents in Marvel Mystery oil are probably the stuff that unsticks
valves.

"Speaking of oil additives...here's an interesting article I came across.
It addresses MMO and interestingly says products of its type aren't
useful in modern engines, but did have their place in older automotive
and motorcycle engines(I guess that would apply to ALL aircraft engines
since they haven't changed substantially or in most cases at all since
the 40's)."

Kinchen, Curtis B 

The link which accompanied this is unfortunately dead but I would assume that the author was referring to the fact that modern engines are lead free so not useful in antifouling. (I,m not sure about the aircooled vanagon. Did they convert them to lead free?). Good idea to use it as a top -end lubricant though

Dom :)

  ----- Original Message ----- 
  From: Todd Thompson 
  To: vanagon@GERRY.VANAGON.COM 
  Sent: Sunday, September 19, 1999 11:42 PM
  Subject: Re: Marvel Mystery Oil; CD-2 Oil Detergent- Additives

  I believe very strongly in MMO and CD-2 in the gas, as an upper cylinder head
  lubricant. I re use the CD-2 bottle for the MMO - I like the measure. I do
  not believe in putting them in the oil unless it is a few miles before an oil
  change. MMO is primarily Kerosene and detergents and will change the oil to a
  lower weight oil. No good.

  Todd T
  84 Westy
  Washington DC

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