0w oil won't hurt.
3.6 miles commute here so I put 0W30 in it and also spent $23 on an ELM237 to learn how quickly the coolant heats up (coolant temp should be close to engine temp).
IMO use 0W30 if you never track/ drive really hard for long. 0W40 if you'll put the engine under stress and really heat it up.
Once a year before the oil change I put Techron through all our cars. Carbon is more likely to build up in cars that do mainly city mileage; am not sure if that applies more so to short commutes.
Six Euro Deliveries since December 1998 (Owned E46, E90, E91, E92 and E93)
28 vehicles in 26 years of driving so far. Guess I like cars
Last edited by MP3_E46; 12-08-2012 at 06:50 PM.