Not a 4x4 but my Merc C270 CDi is approaching 200k km, still in good shape
and well maintained but the turbo has started sounding like an ambulance, it
still boosts but not as before lag is a bit more and own estimate of boost is 2/3
of what it used to be.

Bosch Turbo and Diesel have advised I need to recon it.

Any advise on who can do it possibly on exchange basis, replacing all seals at a reasonable