If you want to limit internal engine corrosion try the following (in no
particular order):


Use Exxon Elite 20W50 and change the oil at least every 3-4 months or 50 hrs
whichever comes first.

Open the oil fill cap after a flight, and if your plane is outdoors install
a set of cowl plugs to keep the heat in the engine compartment even
(cylinders and case will cool more evenly).

Fly the plane often (at least once a week) and long (at least 45-60
minutes).

Ensure that your oil temp gets hot enough in cruise to evaporate moisture
(newer TCM engines have a redesigned vernatherm for this very reason)

Consider pickling the engine if it has to sit idle for more than a month. If
you don't then at least leave it with a fresh oil change.

New cylinders (less than 50 hrs) tend to rust rapidly.


You can find a wealth of information at

http://www.tcmlink.com/carenfeed/englubhdr.html

http://www.lycoming.textron.com/main.jsp?bodyPage=support/publications/keyRe
prints/index.html

http://www.tanair.com/article.html

http://www.reiffpreheat.com/product.htm

http://www.exxonelite.com/

http://www.aeroshell.com/faqs-questions.html


Probably more than anyone wants to know but these are good links to
understanding engine corrosion and many other aspects of engine operation.

Ted Stanley - A&P-IA
IV - in progress