My old 1995 Ford Contour LX V6 5speed has 150K miles on it now.
I bought it used as a lease return with 21K on it. I then got the oil changed every 3-4K with whatever oil where I took it was using (but I always gave them a Motorcraft FL-820S to use) until 90K when I started using Mobil 1 it. I then sold it to my brother at 125K and he's had it since then. I think he might've used Mobil 1 for a couple of oil changes but since then has used regular oil, including Advance Auto's house brand.
The parts that have been replaced on that car have been the struts, the oxygen sensors, the water pump, the front control arms (bushings not replaceable separately), the engine mounts, the front swaybar end links, and I believe that's it. The radiator, fuel pump, alternator, starter, A/C compressor, P/S pump, are all original.
My 1988 Ford Mustang GT has 168K on it now. I've used nothing but regular oil in it changed about every 4K since I got it at 116K. It uses about 1 quart in 1800 miles and that has remained constant since I got it. Since I got it I've replaced the alternator, the oil pump, the fuel pump, the radiator (which actually rusted from the outside in!), the shocks/struts, the harmonic balancer, the oxygen sensors, the TFI-IV ignition module, some of the bushings, the motor mounts, and added subframe connectors. Oh, I also replaced the headlights because they had condensation in them. And I did the mass-air upgrade/conversion and replaced the exhaust which had rusted out.
Oh, the 5-speed transmission was replaced too because it was grinding going into 2nd. I still have the old one; maybe someday I'll try replacing the bad 2nd gear synchro.