The car is now 11 years old, so you would expect it to be worn to some degree and using oil as a result, so putting oil in once per month is not a big deal, providing it's not a lot of oil. I would keep a record of how much you are putting in and show it to your mechanic the next time you get it serviced.

IF IT'S been regularly serviced, the chances of having a problem in the next 3000km are pretty low, but I cannot guarantee you will not have a problem and I don't like recommending that you miss a service. I would have it done if it was my car. It will also make it much easier to sell. I would think you could ask $6000-$6500.

DESPITE its low kms and good condition, a dealer would give you only about $4000. They might give you $500 more as a trade-in. If you sold it privately -- the way I would go -- you might get $5000-$5500.