IMO...the particle count in PU should be higher since the add pack in the high quality synthetic is loaded with premium additives.....vs the Mobil conventional with the new sodium add pack.
IMO....Its like comparing apples to oranges.
Pennzoil uses the traditional add pack loaded with lots of goodies...including a hefty dose of MOLY and BORON.
The Mobil Super Conventional uses the SODIUM fortified add pack like Valvoline conventional and Castrol GTX.
So......Mobil conventional for $2 a quart, before rebate, at AZ, is a good deal for a short OCI.