Tuxing double cylinder - crank screw removal

Exactly, on these things there is no maintenance schedule.
Keep it cool, change oil regularly, don't use auto stop, let the water pump continue pumping for a length of time after shutoff
Ej zdravo Horvát :)
I can recommend you try a high performance oil for european twin turbos. (much higher boil point, less odour).
I am using this one in Canada

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