yo you can use any oil. 5W-30 or 10W-30. I pearsonaly prefer to use full synthetic oil or synthetic blend(hard to find). Synthetic shall give you more power and your engine will run smoother.
5w30
I recommend going to this site for all your Chrysler 300m questions. www.lhforums.com Any name brand 5w30
5w30
10W3010W30
5w305w30
5w305w30
R134a
Any type of certified 10W-30 motor oil will be fine, and 5W-30 may be acceptable during the winter.
standard oil used for the 3.5 High Output engine is 10w40.
Red, 5 year, HOAT type.
Thereis a tag on the filler plug for the differential. On my 2001 300M the tag ready 80 to90 wt hypoid gear oil only.
5w30 5 quarts