in regards to the dark oil, it gets dark because its doing its job, which is keeping your engine clean. if you change your oil based on its color your an idiot.
well great i'm an idiot then.
and i'll just stick to my 3k mile oil change
2003 Grand Prix GTP-3.5 setup, sold it, miss it
2002 Grand Prix GT-top swap, GT1 Cam, SD Headers, 90# springs, 42.5 injectors, 3.4 pulley - sold
2012 Chevrolet Cruze LTZ-Summit White, 1.4Turbo