My 1.6hdi 110 (2005, 92k) has an occasional slight hesitation at very small throttle openings, but fuel consumption is excellent and the performance seems fine.
If it was the old, non-cat turbodiesel Fiat engine in my motorhome I'd treat it to a dose of injector cleaner and diesel additive (works wonders) but I'm reluctant to try that on the much more sophisticated hdi.
Is it OK to use either of these on hdi engines - I'm particularly thinking about that particulate filter and the cat?
I'd also be interested in why I get a very occasional orange MIL - about two a year, usually exiting a roundabout and almost invariably on trips to England (we're based in France)! The code reader says 'turbocharger high', and there's no difference in performance or economy before or after I turn it off.
Any advice or comments would be most welcome