Our one used to go through a bit of oil, prob about a litre every 1k - 2k miles?

I did read somewhere that these engines can suffer with sticking rings caused by lack of oil changes and getting thrashed from cold???

After a good hard run to try and clear it things improved dramatically and its been much better for the last 3 years or so. Prob goes through a litre every 5k - 6k now but it has mega miles on it