I do have a question for the experts in the LOC. Having read through loads of LOC posts, I understood that the cambelt needed changing at 6 years/60k miles whichever is soonest. However, my Lexus service handbook states that the cambelt should be changed at 100k miles - no mention of a time period at all. Did Lexus change the IS canbelt system from 2004 to make the replacement requirement less frequent?