In particular I'm referring to 5W30 High Mileage PP and QS. So the PP is 15000 mile and non-dexos and the HM QS is 20000 miles with dexos. Now I know this is really not a big deal and the whole dexos thing is marketing but since I always thought that of the two brands which are the same company, that the Pennzoil is the flagship of the two. Any idea why this would be?