[snowman]

Not been started in 10 years is not as bad as never been started. Its still not good, but not as bad as an engine that has never been lit off. The biggest difference is that you will not have dried out gunk clogging all the oil passages. You will have dried up gunk trying to clog up passages and it just might be possible to clean it out, somehow. On the other hand 10 years is a very long time. I would check and see the condition of the oil, is it ok or is it gooey? If it is gooey and or dried up and solidified in places, then I would consider tearing it down and giving it a very good bath. New seals everywhere. Many engine parts have a life, used or not of about 12 years, unless protected by some special environment. Metal parts even corrode or oxidize. A Porsche sitting in a garage is going to degenerate somewhat, unless its kept in a nitrogen atmosphere or some very controlled environment, like the museums use. Even then I suspect they need to be run once in a while to be kept whole, ie seals dry out without some fresh oil on them.

I am not any kind of expert on this subject, but I have seen the result of cars stored for 2, 5 and 10 years without attention, and an engine that was never started for over 2 years. I have also seen the results of some cars, eg a 1949 chev with 10,000 miles on it that was brought to college by a friend in 1971. Didn't last long.