I see that the car is out of warranty on mileage but not age (I think the third year is limited to 60K.) I had a gearbox fail under similar circumstances, and after some negotiation between my car's leasing company and
, Renault made a 50% contribution. Try them, and see if they're prepared to soften the blow
As for keeping the car - it could turn into a moneypit, but the same's true of anything with wheels and an engine.
The 6 speed box is a weak point on early L2 dCi's (not that any Renault gearbox is built to last) but I think they had this sorted before 2003 and the 6 speed is no longer any less reliable than the rest.
failure due to the wrong grade of
and excessively long service intervals is the other fairly common serious problem. Moving to 5w/40 is supposed to help, but it also pays to do an
and filter change at least every 9K.
The different grade of
wouldn't affect the injector. 10w/40 was the right grade of
until Renault changed their minds due to the
problems, so the engine was designed to run on it.