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I got PP in there now and had MC in there before this current PP fill and I would say go with which one gives you what you desire the most for your car.
Wait. Let's back up and identify what your most foremost desires are in terms of attributes desired from motor oil. I would say the top 3 or 4 things most, not all, people look for from oil: (I am more of #s 1, 2, 3 so that is why I put the ranks but yours may differ)
1. First in importance - Performance- For my rev-centric engine, I look for slickness or just overall 'better performance'.
2 Second in importance- Fuel economy- Kind of goes hand in hand with being 'thinner'(#1) or 'slicker'(#1) or whatever you want to call it. Generally, the thinner the oil, the better FE.
3. Third in importance - Enhanced Low end tug or torque. Big time requirement if you do predominantly city driving where revs vary to absolute low to mid range and then up more and then right back down to low to mids predominantly.
4. Fourth in importance- Protection - for those who want that 300k mikes out of their engine and want the absolute "best possible' to every iota possible. I would kinda lump 'smoothness' in here since most synthetics that protect the absolute best also tend to be extremely smooth intrinsically. (I'm sure there are some exceptions out there but I haven't heard of an absolute abysmal synthetic)
I think PP favors #3 as well as #4 in that is better for city driving and in low gears/rpm where it's more robust and thicker 5w-20 helps. I also think since it has good UOAs, that #4 protection is inherently important to full synthetic PP users so many place themselves with that category in terms of importance and smoothness is something PP is extremely good at. (atleast mostly in the low-mid gears)
I would say that perhaps MC is better at Numbers 1 and 2 in terms of it's strength of revving and mileage. I have an idea that Schaeffers is more comparable to PP since it is a synthetic. I do not know Sch. strength and weaknesses in terms of its UOAs and general user-performance.
Between Schaeffers and PP, I would go with whichever does more of the above better.
Pure money. Questions, comments?