New A4 1.9TDi (2005) Variable service ????

Hi
I have been driving A4's (1.9TDi) for quite a while now and the last few have been having their service around 19-20K
I have not changed my driving pattern (mainly motorways) and my latest one
has also shown the service interval to be due at 11k.
I was in the Audi Garage and they were obviously had someone on the phone with a similar query to mine, but they say there is nothing they can do.
Anyone else seen or heard about this "Problem" ?
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Maybe when it was in last service Audi didn't use the long life oil? or perhaps they didn't set it on variable service, and just kept it on standard.
Does it instantly show 11k when you drive it after having a service, or does it work out 11k after say 5k miles driving, I know my Audi has gone nearly 30k miles without a interval change before.
Long Life services are based on driving habits and I think it knows the oil type used, but the dealer when he resets the service indicator sets either long or short servicing.
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It is brand new and it worked out to be 11k after about 2k and never changed ( i.e milage + mileage till service = 11k)
Audi have said ALL settings are correct.
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My car says 'service' at 20k even though the next scheduled service isn't until 25k miles. It's irritating but I think in the US, when they changed the interval from 10k - 20k - 30k - 40k etc. to 5k - 15k - 25k etc., they didn't update the indicators in the cars. But I change my oil every 5k anyways, so not a big deal.
Dan D '04 A4 1.8Tq MT-6 Central NJ USA
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