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Can I use silicon oil (only thin layer) for conservation transmission and another gear boxes before final assembly on the frame?
And second question: Can I use 80W140 oil for all transmission without any risk?
Thank you for answers.

Why don't you use the proper recommended SAE 90 gear oil with low sulphur content?

Because guy who is restoring jeeps in Holland recommends me this kind of oil. My question was just to be sure that is correct.

Do not use silicon grease or silicon spray lube in a mechanism that is normally operated on a petroleum base oil. The silicon can never be completely flushed out of the system. If you want a temporary preservative use LPS3 or the equivlent.

You can use the modern multigrade gear oils like 80W140 but you must select a brand that clearly states their oil's sulpher content is low enough not to harm non-ferrous metals like brass synchro rings in your transmission.

Thank you Wesk. Till now I used spray silicon on some parts in transmission, so I hope that it is no big problem or have I to clean it again?
In my country supplier doesn´t know LPS3, i must try to find other equivalent.

LPS3 is a simple oil (petroleum) based spray oil. You do not want to use an oil based preservative oil when your primary purpose is lubrication. Those leave a sticky film on surfaces to help prevent corrosion.

There are no cleaners that will remove every trace of silicon. This is one reason I avoid its use.

O.K. and thank you again Wesk.