[240 2NR]

96SECHICK- I'll agree with both weights since I run both myself. 5W-30 in the winter and 10W-30 in the summer.

Cheesy- My guess is you problem is unrealted to oil weight but may be due to too much oil or another problem entirely. The dipstick reads a quart, so if it's at the L it's one quart low, if it's at F it's full and over full means you have too much. If it doen't even make it to low you have problems, but should only add oil one quart at a time and after each one check unless you drain completely before reflling.

Personally, since you can't describe the problem well enough, I would find a person you know who's good with cars and have them look at it. It could potentially be a lot of things (did you check you plugs?) and simply stating that it runs funny doesn't work in the internet world unless you have a vid to go with it. Seriously, it could be the ecu, vacuum leak, plugs or as simple as you putting the wrong grade gas in or something.

Oh, check your oil filter and make sure it's on tight enough. If you've got a lot of oil under your car it could potentially be loose and leaking. Otherwise get under there with some towels and a shop light and find that leak.