I use to be loyal to Mobil to the point I don't see the other brands when I go to buy oil. Like I don't even know there are other brands that might be "better." Talk about being institutionalized... Now I am thinking of just buying the cheapest stuff available that is certified which at the moment happens to be MC5000 and/or Wal-Mart SuperTech.
As for filters I have always felt I am never wrong when I use the factory filter from the dealership however I am not above using a wix, purolator or even a SuperTech filter. Biggest selling point with the factory filter and its probably stupid but its wrapped in plastic in the box. Never seen another filter in a parts store that does this, even the "premium" ones. Just a hassle going 7 miles to the dealership before they close. I have had anti-drainback valve failures in M1 filters (twice) and Bosch so I avoid those. Never had trouble using OEM, ST, STP, etc. More of case of not being brand loyal but just going with what works and avoiding what doesn't from personal experience.
As for filters I have always felt I am never wrong when I use the factory filter from the dealership however I am not above using a wix, purolator or even a SuperTech filter. Biggest selling point with the factory filter and its probably stupid but its wrapped in plastic in the box. Never seen another filter in a parts store that does this, even the "premium" ones. Just a hassle going 7 miles to the dealership before they close. I have had anti-drainback valve failures in M1 filters (twice) and Bosch so I avoid those. Never had trouble using OEM, ST, STP, etc. More of case of not being brand loyal but just going with what works and avoiding what doesn't from personal experience.