I've seen a couple of threads by people who pulled their valve cover off at various mileage and it seems that people are interested to see. So here is what my engine looks like after 70K miles and 7.5K oil changes (well every 7.5K after I bought the car with 38K on the odometer since I don't know what the previous owner did). I think it looks pretty good and I did not see any sludge in there at all. I realized i could also take that black cover in the pictures off after I put the camera away already.
Starting from when I bought the car at 38K, I used Mobil1 5w30 for 15K miles (two changes), Mobil1 0W40 for 7.5K miles and OEM Castrol 5w30 up to 70K miles that I currently have. Prior to 38K I know from the car history that the previous owner had 3 oil changes done at the dealer so I assume OEM Castrol was used.
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