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Half the trouble is going to be fitting a diesel engine in the engine compartment, a VW engine is not going to fit, at least not from any VW's that were sold in the USA and VW put the smallest diesel engines in any diesel car in the USA so you are going to have to go with something from a very small tractor or generator, then you are still going to need the offset transmission that you'd get in a car with the larger 4 cylinder engine.
Other problem you are going to have is that the stock Metro engine is very light, I think the 3 cylinder one is around 70 pounds and the 4 cylinder one is around 90 pounds, a diesel engine is going to have a cast iron block in be closer to 200 pounds.
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