I've a 163PS diesel XE and the low DEF came on with the car approx 5 weeks old and with 2200 miles of standard motorway driving in normal mode. A day or two later the 500 mile countdown message appeared 'no engine restart incorrect diesel exhaust fluid detected'. The leasing company doesn't covered the expected 'once between services' top up and the nearest Jaguar dealer quoted £50 for the supply of DIY containers (not sure if it was for one or two). As I've a fuel card I bought 3 * 1.5 litre REDEX containers at £10 each from a Shell garage. That was yesterday and I've since driven about 30 miles, 3 journeys, 1 hour driving and now the car still plans to shut down in 456 miles. Any advice from members would be much appreciated.