It should be listed in the manual. If you don't have that, I'm sure it's available on the internet somewhere. The Dodge website has 2004 and on, but the 2004 manual would probably help if you can't find one for the 2003.
I have a 1999 Dodge Neon with 130,000 on it. I put in 10W-40 because I don't live in an extreme climate and I've never figured out how to decide anything beyond "10W-40 is motor oil! I have a motor, and it needs oil!"
The main thing is to be consistent. If you mix motor oil - ie, the person who filled it before you put in synthetic and you put in real, or you pick a different gauge, that can be a HUGE problem. And I pretty much only say "can be" because otherwise, fifty seven people will leap out of the woodwork to explain how their aunt's best friend had a Yugo that they put 5W-30 synthetic into, but then they found out the original owner had put in real 10W-40, and it was TOTALLY FINE. My understanding is that it will not be totally fine.
I was going to say, look on the oil cap. Because whatever that says is not only what the manufacturer recommends, but is also what is most likely to be already in there.
Whatever oil you pick, you can try what everyone in my family does... we write whatever type of oil the car uses somewhere prominent in permanent marker, preferably near the oil cap on the frame. :) Saves stress.
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The main thing is to be consistent. If you mix motor oil - ie, the person who filled it before you put in synthetic and you put in real, or you pick a different gauge, that can be a HUGE problem. And I pretty much only say "can be" because otherwise, fifty seven people will leap out of the woodwork to explain how their aunt's best friend had a Yugo that they put 5W-30 synthetic into, but then they found out the original owner had put in real 10W-40, and it was TOTALLY FINE. My understanding is that it will not be totally fine.
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