I didn't know that on either account.
But am I incorrect in thinking that as long as the 100*C viscosity is the same, and living in a colder climate, wouldn't I be better served by using an oil that flows better at cool and cold temps?
If I am thinking this wrong, please correct me. I'm sure I could use any oil brand, and probably about 85% of the oil viscosities on the market and be fine. But I am just looking for a change it once every 8k or 10k miles and never worry about it. Other than pulling the dipstick to check the level every so often.
If 5w-20 is the better oil for my application, then that's what I'll buy. I'm just not taking Dodges word for it. That's why I asked here, I figured there was probably some folks on here that have vehicle lubricants all figured out.