They are a bit similar to the L200 truck - the 2.5 diesel is the same motor.
The reason for the head gasket problem previously mentioned is usually that the EGR cooler corrodes through, the coolant leaks out and the engine overheats and thus the cylinder head distorts and the head gasket leaks.
Other problems are the front pulley/harmonic balancer delaminates, if not caught in time it may wreck the cambelt cover and then the cam belt.
The balancer belt is prone to shredding and then gets in the cambelt which then jumps a few teeth, messes up the valve timing and the valves hit the pistons and either break the rockers or the camshaft bearing caps.
The 2.8 is not hugely more powerful than the 2.5.
They are an old fashioned body-on-chassis thing.
Old fashioned as in 4k-5k mile oil changes,because its an IDI diesel, and laying underneath with a grease gun looking for all the 15 or so grease nipples every year.
Unless you are handy with the spanners I wouldn't
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