Their Ultra is positioned as their best product, so I would get PP Ultra 5W30 and use that.Thanks for your thoughts, guys With the Pennzoil platinum rebate just starting, it seems like it will be pretty hard to beat two 5qt jugs of either Ultra or high mileage. Is Ultra better overall than high mileage (because it’s cheaper right now)? OTOH, the $6 difference for 2 isn’t going to kill me I understand manufactures recommending thinner and thinner oil for a fuel economy, but am I likely to see any difference between 5w20 and 5w30? If the answer is no/probably not, I can use 5w30 in my Volt and my turbo Subaru (I typically run heavier oil than that one though). Since there appears to be a limit of two per household, maybe my smart move is two jugs of 5w20 high mileage platinum and two jugs of 5w30 Ultra…. Thanks!
In Australia the same car would have 5W30 or 10W30 or 10W40 in it. But honestly nothing wrong with 5W20 as per the book over there.
Also, just my 2 cents, Valvoline MaxLife Red (semi-synthetic) 10W30 (API SP) would be a fine choice. You live in Arizona I believe, so probably a suitable climate for 10W30.