One week out from their Geneva Motor Show debut, Nissan has revealed the full details of the updated Nissan Pathfinder and Nissan Navara ranges.

Headlining the mid-life upgrade is an all-new direct injection V6 turbodiesel.

Developed by the Renault Nissan Alliance, the unique power plant sits at the unusual vee angle of 65 degrees and its block is made of Carbon Graphite Iron, which Nissan says offers all the stiffness and noise absorption benefits of cast iron without the weight penalty.

Power output peaks at 170kW and torque is a class-leading 550Nm between 1700 and 2500rpm. All of this is achieved while complying with Euro 5 standards, thanks to Exhaust Gas Recirculation which reduces NOx emissions and a metallic oxidation catalytic converter, exothermic catalyst and a catalytic diesel particulate filter.

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If you're like the majority of 4x4 Drivers, you won't be able to change the diff oil until you get home, because you won't have spare oil and a sump pump to change it. If you suspect contaminated oil (a deep water crossing without extended diff breathers or perhaps you have leaking diff seals) then you can try and remove the water by draining the diff until only oil comes out the drain hole. Do not drain too much and leave your diff short of lubrication. Collect this oil and water emulsion as you should never dispose of oil into the environment. Save it till you get back home and dispose of it properly. Its not only diffs that can have water contamination, but also your gearbox, transfer case and engine oil. However, it is usually only when a vehicle is stationary in deep water that these components are contaminated.