2001 Dodge Neon?

if you use a 5-w-30 it will start and run a lot better in colder weather,i use a 5-30 all year round in mine i wont switch it until it starts to use oil which i hope isn't any time soon,but either of those oils willl be alright for that car,i have well over 100 k on mine and still running 5-w-30 in it,so if you can use that in it, it wil be better for it in the cold weather,good luck with it.

I use W40.It really depends on the mileage,and how often you change the oil,and the condition of the motor.I drive a 98 Dodge Neon.I try to keep it changed at ever 3000 miles..

The owners maunual should tell you or just call the local dodge garage and ask them. That would be the safest thing to do. Even most auto parts stores will have the listing you need

Look in the manual or on the oil cap, it should say what they recommend on it.