Hello friend,
because from my experience, it seems that the shortest path is the curved line, since the air filter must be removed, in order to access the gasoil filter housing, in addition to loosening some brackets of the cables you find ahead, and so you can access the lower part, where the tank of water condensed in the filter is located, which you have to unscrew and release, to change the filter, to change the filter, to change the filter, to change the filter. screw it to the new filter ... total that spends more time removing and putting pieces than changing the filter ... an achievement in design. Luck !!