Lee,
I'd go with what Neill Says.
Though,
You might consider doing a quick turnaround in oil AND Filter changes;
say @ only 1,000-2,000 Klm
I change my Filter EVERY time I change the oil.
5,000 klm...............cheap insurence.
To keep costs down, use a cheaper oil for the first change,
NOT Bottom of the shelf.
That oil would still be quite usable for other purposes.
Top-ups, or in my case,
use in the Donga, a Farmyard Hack-car.