I changed the oil and filter in my wifes 2006 Polo 1.4tdi over the weekend. No problems. Re-filled with 3.8 litres per the handbook. The oil was at the low end of the dipstick but I left it - figuring better at the low end than over filled. After about 20 miles driving the low level light came on and I have put another 200ml or so in - is the 3.8l an under estimate or any other explanations? The car is running fine so I am not worried about it just curious!