Joined: Jul 2010
Location: Gatineau, Quebec
Well, having compared with the X trail service manual, looks like I lose my bet. The flat gasket that goes against the block with 4 holes looks quite similar, but the actual oil cooler is different than the flat top plate one in the Altima video and the part diagram from Nissan part zone.
In the X trail schematic from the service manual the gasket in the oil cooler is an o ring. From the looks of it, its more similar to the one in the infinity video, but its not behind the oil filter.
As its in back of the engine, I couldn't see mine from above, but it should be on the lower back part of the engine passenger side.
Not sure if it can be done on jack stands, but I guess with the wheel off and wheel well cover removed things might look brighter for removal. If you don't have the service manual, I could send you the relevant pages.