Linseed oil. Fireworks.
Short night visit to the shipyard, to check on oiling status. Both jugs were almost drained and bilge filled with oil so it was about time to re-circulate liquids.
Instead of time consuming oil suction from the bilge (below engine is the lowest point) I simply drained the oil into bucket by opening dyviken. About a glass of the liquid got spilled but otherwise it worked pretty good. Based on the amount left I estimate that wood took 1 litre of the solution within 2 days.
Re-filled the jugs, adjusted flow speed and headed home.
But before that - the usual ritual of burning all paper towels which got soaked with linseed oil - to avoid spontaneous combustion.
How romantic…