My 3.6 barely uses more than 5 quarts when I change it, and I am what some call 'anal' about my car. I am always fine when I go into AutoZone and get the oil change special for full synthetic which gets me 5 qt and a good filter for $26. I just have a single qt bottle on hand if it needs some but I have never needed it.
Amsoil states 5.5 quarts, and they're normally right on the mark, but that's to FULL capacity. As ralthoff mentioned, if you use just over 5 quarts you should be in between the minimum and full marks on the dipstick, which is where the oil level should be unless your 3.6 consumes oil throughout an oil change, then it's best to put more in from the get go.
__________________ 08 G6 GXP Coupe -SOLD- for an M3 but the new girl still can't replace her
10,000K HID Low Beam, 10,000K HID fog kit, Eibach pro lowering kit (with 1 coil cut at the front), white LED interior lights (map and dome), custom front side license plate mount, custom DynoMax Exhaust w/ custom resonator & 2.5" piping (used to be w/ Magnaflow), K&N Air Filter, HP Tuners VCM tuned, 20x8.5 Gianna Blitz rims w/ Nitto tires, Garmin Nav-Tech, tinted windows, white LED rear license plate light, aluminum brushed custom pontiac badges, redded out tail lights, custom aluminum color painted brake pads..
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