Guys, does anyone know for certain what triggers this warning to come on. Mine clears with the IIDTOOL but comes straight back again but there are a couple of faults that also come back that the IIDTOOL sees but doesn't clear could it be these that cause the problem or is the warning really just mileage based? Geoff

Mileage / time based I think. Ed

As above either milage or time based Geoff...

as ^ but also the car knows how much towing it has done so if you do tow it should come up earlier ( at least I think so - MD told me that)  405 AB exec seats Baltic and Cirrus
93 RR Classic efi

Remember it's easier to get forgiveness than permission!

Gone in order:
4.4 TDV8 SE - gone to a good home
93 Classic hard dash Plymouth Blue
03 L322 Oslo Blue
2000 Disco TD5 ES Epsom Green
98 P38 Rioja Red
89 Classic Cairngorm Brown

Cam-Tech-Craig wrote:

As above either milage or time based Geoff...

And, even if you reset it with the IID... It still knows the oil is f d sir (thats a highly technical term!)

I was told by a salesman recently that there is an oil enzyme that deteriorates and there is a sensor on the car that detects that.

TBH - I thought he was full of - but maybe not....

No no Alistair, that is correct sir

My 2p worth, even if you do low mileage like myself, still change the oil and filter after 12 months.