This was simply an observation that the single 5 quart jug price of Pennzoil Ultra Platinum had gone sky high and that the M1 and Castrol comparables had not.
Drill into the Google search results. It won't be $32.51. For example, NAPA shows $34.99 in Google search results, but the actual site price is $64.99.
What has happened with Pennzoil's Ultra Platinum pricing?
It was around $25 on Amazon (and Walmart) and now it's over $50 for a 5 quart jug.
Castrol and M1 have had some minor pricing fluctuations, but nothing like Pennzoil.