Howdy. Bought a 2007 with 7200 km two months ago and have currently brought it up to 9200. The previous owner had not done any valve checks and not sure if any was performed at 6000 km ( as per the owners manual ). I have heard that the valves need attention at 9000km or you risk greater internal damage. (??) I would like to wait until the 12k mark ( manual ) but am a little leary of pushing my luck. Also have heard of folks who never need any ajustments. Thoughts ? Thanks.