please let us know when your 09 throws the timing chain codes. i think it is a design flaw, but hope i'm wrong.AFMoulton said:Reguardless of what the OLM says I religiously change my oil 3000-4000mi.... to avoid something like this. It boils down to this...if you take the time to take care of it and keep clean oil in the engine then what do you have to worry about....if you wanna believe a computer then go for it. I will stick to good old fashioned tried and true maint. IMO.