I ran it in my 2007 HHR and the 2.2 engine in that car was a freak-- it ran really strong, so strong it molested the automatic transaxle, lol. But the HHR loved MC5000. I had it in my Forester before the most recent oilchange which i tried Havoline DS. I liked how the engine felt on MC5000 better, as far as responsiveness. But the MC5000, at least the 5W30 which is all I have experience with, did seem to allow a tiny bit more valve train noise than what I'm hearing with the Havoline.
The refinement level of the base oil in MC5000 is stated as being "Severely Refined" on the MSDS. Havoline DS's MSDS only states "Highly Refined."