About to do my first oil change on my 2.5si and don't really like the fact that there is no dipstick. I know it takes roughly 6.5l but wondering what extent you guys go to in order to make sure it is filled with the correct quantity? I'm not sure how accurate the measurements are on the side of the oil containers so was thinking about getting a measuring jug. Measuring the amount that drains out and putting the same amount back in. It's currently reading full on the computermabob. Any opinions?