Borderlaw, I'm interested, don't they overhaul the engines regularly over there? Here they have a "life" of 2400 hours, which I understand comes from Lycoming, then out it comes and many dollars later you have a good as new engine. I've stuck an oil cooler in one of mine which makes a big difference in operating temps and therefore saves in engine wear and tear. It cost 3 aussie grand to install but oil temp never goes above 180 deg F even when it's over 40 deg C outside, while the other tomahawks all sit just below the red line oil temp when it goes over 30 deg C outside. But they all sit on 20 litres an hour fuel consumption, less if doing lots of glide approaches.. .But we use a figure of 22 litres per hour for a bit of a safety margin.