Pennzoil Platinum & Pennzoil Ultra Platinum.....it's my understanding the only difference between these 2 lines is the extra detergents in PUP for better cleaning & longer OCI's. Looking at Pennzoils website, the PP has better looking numbers than PUP, especially NOACK values. The VI of the PUP is slightly higher than its counterparts in PP which indicates to me more additives like VI improvers. I guess what I'm getting at is that I don't see the almost $2qt difference in price between the PUP & PP lines. If anything I'd be more inclined to go with PP vs PUP going off of Pennzoils specs on its website.
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