[AZDieselGuy]

Will be changing the oil shortly. Can order the oil on Amazon Prime. Which one is best?

6 qts of the Pennzoil is about $20 less than the Mobil 1. However, I am not too concerned about the cost.

 

[Yo momma]

Both meet the spec. Buy the Pennzoil.

 

[snowwy66]

I like better economy and go with the cheaper stuff. I can't vouch for diesels though.

 

[RockyMtnMax]

Opinions can vary, but the oil analysis data I've seen suggests neither of those really has a meaningful advantage over the other in our applications. The Pennzoil yielded almost identical sampling results as the Mobile 1 in my trucks, so I went with the cheaper of the two (until switching entirely to 5w40 Rotella).