I was told I need to wash our Jimny. I'm not sure this was the way though.
An oil leak or two were fixed just a quickly by exchanging a leaking air pump and a return pipe to the fuel pump.
The Jimny didn't give any problems at all, so we can conclude that, even if it's a bit small, the Jimny is very capable of a long overland trip on paved and unpaved roads.
More photos of this trip