I've got abut 3,400 miles on my tC, and just checked the oil for the first time. Oil level was just above (between 1/4 & 1/8 inch above) the L on the dipstick, and was a little dirty, but not terrible. I have to leave on a road trip tomorrow night, and don't have time to take my car in for an oil change before I leave - besides, I'll be doing my 5K service soon anyway. My question is, with my oil being at that level, do I need to top off before hitting the road (wll be driving about 800 miles round trip), or should I be good until I get back, and potentially until I hit 5K? If I do need to top off, how much should I put in, just to get me through to the 5K service?