Ive checked the oil level the other day and noticed it was on the minimum mark, and since owning the car have not put any oil in it before. I know the oil thats in it, is castrol 10w40 semi synthetic, but not sure what type as ive noticed there are a couple of different ones in that grade. Does it matter what type of oil i top it up with as long as its semi synthetic 10w40 oil? Dont wanna screw anything up by putting the wrong stuff in.
Also, the last time i checked the oil, about 1200 miles ago prob, it wasnt on the min mark, but it is now. Is it normal for the oil level to drop slightly over time?
Cheers, Jake.