For straight out reliability I would be going with a GM LS1 / LS2 or Toyota 1uz / 2uz. It is a very easy swap to do, these motors are cheap for what they are, easy to work on, parts from the states/japan are readily available and cheap and its hard to beat a v8
I wouldn't be putting a common rail in it (temperamental shits and too expensive if things go wrong) and unless he's doing biiig kms the benefits of a older modelled diesel motor just aren't there any more.
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