Have you looked at engine repair costs ? If everything else is in tip-top shape, then a couple of grand spent on the engine maybe worthwhile and just run it into the ground ? The c.€1,500 annual tax bill is of course a tough pill to swallow in a relatively low value car.

Even in perfect working order, a 400,000km pre LCI 535d isn't worth a whole lot in this 'cheap tax & PCP only' obsessed country.