@ jrthomas:

Thanks for your reply, how often do you fly with this engine, every week or do you have had long breaks about a few weeks or months?
I can't find a translation about hobbs?

@ Av8r-Sed:

Thanks for the example, I never seen like this before.....

Know we are 4 pilots, whitch fly synthetic oil in our two-stroke engine, it's surprised because in germany many pilots use mineral oil because of "better" conservation. I think, during long breaks mineral oil is better for conservation than synthetic oil, but during fly and for clean pistons and rings, synthetic oil is the better way. Anybody agree?

Does anybody use the "conservation process", pull choke before stop the engine like the rotax manual?

I use this oil:

http://www.castrolmoto.com/de/produc..._racing_2t.php

with this specifications:

http://www.castrol.com/liveassets/bp...DE_2011_06.pdf