Thereis a tag on the filler plug for the differential. On my 2001 300M the tag ready 80 to90 wt hypoid gear oil only.
A Chrysler 300M uses ATF+4 transmission fluid.
DOT3 or DOT4
Mopar ATF+4
If you pull out your transmission dipstick the info you need will be on there. ATF+4
R134a
I recommend going to this site for all your Chrysler 300m questions. www.lhforums.com Any name brand 5w30
R134aR134a
Red five year, hoat type.
Red, 5 year, HOAT type.
5w30
Red, 5 year, HOAT type.
Red, five year, hoat type.