My 1993 TD10 used plenty of oil from new especially on long runs in the hot climate of Southern Spain. I put things down to generous clearances in the engine because there has never been any sign of leakage past oil seals. It's just the way Fiat make engines I fear. I agree that it should not be so, the cost of lubricating oil is such that a pint or two a week makes a dint in the economy of running any vehicle. I mitigate things by buying Ertoil or Cepsa HD10W/30 oil in 50 litre barrels, which at 130 euros works out at 2.6 euros per litre, and it's the same oil I put in my 400hp truck engine which works hard all day pulling 45 tons around, so I call that good enough for a motor caravan.