We all know classic cars have soared in value and may or may not be an investment but instead of Petrol, is there a market for old school diesel's, wait for that amber glow plug light to extinguish and a hard crank of the key. In the 1990's and following 80's the French had huge market share in Diesel's both PSA/Renault throughout their model ranges and many other car manufactures used PSA engines. 

 

A less common Diesel which If I remember correctly stood up well against the French in regards of reliability and fuel economy of the day was Fiat's 2.0L (1929cc) unit. An extremely rare Italian classic I'd consider owning but unlikely to find one is the Tempra which ran from 1990-1996 and wasn't a big seller on the UK market in it's day. Only 129'000 were made total across across the world so not a big number all in. 

 

 

I daily drove a Peugeot 205 D Turbo for quite a while, a fairly rare variant with some GTI trim and the XUD7TE turbodiesel engine.  It was excellent to drive, with the trademark tight 205 handling and great torque and economy.  The usual French electrical gripes were present, but easily rectified with afternoons of playing with a multimeter and the occasional repair or retrofit.

 

As for the market - the Pug was sold for roughly three times what it was bought for, although the costs of ownership (including servicing, head gasket, turbo seals, suspension fettling etc) almost certainly outweigh that profit.