Originally Posted By: threeputtpar
Originally Posted By: bmwtechguy
I seriously doubt it is 40-60% PAO. Probably mostly group 3 with a
decent add pack leaning more toward anti-wear.
This is the correct answer. Pennzoil leans more toward cleaning additives.
AW additives and cleaning additives are in constant competition. The AW tries to cling to the metal parts and be a sacrificial boundry, and the cleaing adds try to pull things off of the metal parts and suspend them. If you have high amounts of both, the will continually try to cancel each other out.
I have noticed, in my Honda's K24, that various Pennzoil synthetic products (Pennzoil Platinum 0W-20 and 5W-20, and Pennzoil Ultra 5W-20) seem to allow/create more engine noise than other oils. The general "din" from the engine, the mechanical noises, are much more apparent. The engine makes noises with these oils that it doesn't make with other oils. One of the quietest oil I've used in it is Mobil 1 0W-20.
Can it me that the type of additives allow or contribute to engine noise? I have not yet tried Quaker State Ultimate Durability in it, but am considering it. I wonder if Quaker State Ultimate Durability 5W-20 would be significantly quieter in the car than the Pennzoil synthetics I've been using.