I run Mobil 1 Full Synthetic with a 1/2 quart of Lucas Oil oil stabilizer into my DD, non-tracked Z with 40K+ miles. I know the flaming is bound to start because I'm putting "snake oil" into my precious Z but I have a reason for it.
Many moons ago I had a 1984 Honda Accord 4 door with 130K miles on it and I was running the full dose of Lucas Oil stabilizer which did in fact keep the small amount of smoke it was puffing at bay. Without my knowledge my oil plug fell off or was taken off sometime between my weekly oil level checks. I checked my oil level and it didn't even wet the dip stick. I looked under the car and saw that the drain plug was gone. The engine temperature never increased, the engine purred quietly the whole time and there weren't any oil puddles on my driveway. I continued to use Lucas Oil until about 225K miles when I gave the car away to a relative. I was running the cheapest oil on earth at the time since I was only in high school so I have to attribute the miraculous survival and longevity of the car to the Lucas Oil stabilizer.