The trouble with tinkering with a car is you slowly notice more noises than you fix ! Anyway, a couple of weeks ago I noticed a light tappet noise on startup which pretty much disappears once the engine is warm. The car was serviced when I bought it and I've only done around 2k miles since. The oil is still a nice clear golden colour but I did notice a very light deposit of crud at the top of the oil filler (so light that it was all removed with one wipe of a paper towel). There are no misfires or performance flat spots and aside from the battery, it fires first time on the button. I'm now in two minds as to whether to get it serviced 6 months early or, I suspect, I've just got used to the other rattles etc that I'm picking up a noise that's always been there and is perfectly normal for a petrol engine (having driven diesels since 2002).