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I have 350 hrs on a TSIO 550 B/B built in 1995.  So far the oil consumption
has been about 1 qt every 20 hrs.  I use Aeroshell 100 and change it every
25 hrs.

I am expecting to have top end problems beginning around 500 hrs, but I
would be interested in others experience with the "B" model.

Bill

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.