Damn it where's 7th gear when you need it?!
With just a top up your not really going to change the overall characteristics of the oil so shouldnt worry yourself about it. Besides, as you've probably seen there's been a whole lot of debate in the past ref 30 or 40 grade oils so depending on who you ask its probably the correct oil for your engine anyway!! Its more important if your doing regular top ups of course or a complete oil change to get the "recommended" oil in.
A4 3.0 Quattro Sport - Gone & missed everyday!
Current road going missile.....
........Smart Roadster - arguably the most fun you can have in a car without using lube!!