It's done 83k (mileage), as for oil i haven't topped it up as of yet as i've only had the car for about 3-4weeks. The engine itself is a recent rebuild and i've been informed by the previous owner that it's only done about 1k. Before i took it out last week i checked the oil level and it was just over maximum and now it's in the middle of minimum and maximum. The last owner told me to use Mobile 1 oil. The tapping noise started all of a sudden after a few minutes warming up so i'm a bit baffled....