I've heard several people claim that the 5.7 Hemi engine was designed to run its best on Pennzoil, is this true? Because I've ran Castrol in all the hemis I've ever owned and have never had an issue whatsoever. Is there more to this? Because I've always heard Pennzoil is a trash oil that will sludge up an engine just like quaker state. Castrol Has always left my engines clean upon visual inspection's at oil changes and all but I'm looking for the real answer. Was there a backroom deal between Dodge and Pennzoil I never heard about? Also I've never had any wear or oil pressure issues running Castrol versus Pennzoil so what do you folks think?

 

Use the correct weight oil from the manufacturer of your choice, and change it when it needs it, and any oil will be just fine.

 

No lol....like he said, correct weight with almost any oil will do, though I tend to stay away from generic brand oils and I'm definitely a proponent of synthetic. If you look at the oil cap of a 6.1 hemi, it says "Mobil1" right on it:

 

I was curious because I put Castrol high mileage 5w 30 in instead of the 5w 20 and at idle even though it still runs totally fine, it threw a P0524 low oil pressure code. So I'm thinking just change the oil to the correct weight, delete the code and roll on. Guage reads good at idle and everything.

 

The band doesn't really matter. Just Make sure you use the correct oil. I've always used Valvoline in my trucks