Celso:
We don't have the DTE Light oil in Chile and most of the jet pilots have decided to switch to 2T oil because is less toxic. We just made a big purchase of Motul 710 which is the oil we are going to be using (same oil being used in the Jetcentral factory to try all their turbines).
Is not an expensive oil and the fact that you can use it at 2%, makes it a very good alternative.
Regarding Mobil DTE, I understand that its recommend it at 5% and some manufacturers like Kingtech are not recommending it since they have seen some problems with the bearings
http://www.rcuniverse.com/forum/m_11342374/tm.htm