Questions: Fluids and Wiring

easyrider said
I'd double check that engine oil. From what I've see, the Gen 3 Hemi uses something like 5W20. I know I wouldn't put Rotella in it. Just me.

I've gone to LX Forums and read quite a bit over there. I'm not planning to use Rotella. I'm going to use Mobil 1 and the factory fill for the 6.1L is a 0w40. I'm asking if it really matters as some have said it does and others not so much.

I can get 5w30 Mobil 1 cheap but will it harm anything? Even the oil cap says 0w40 is whats suggested.

Riddler