Mobil Super 5W20 is $14.17 for 5-qt jug, SuperTech is $12.72, the difference is $1.45.
If the average OCI is 5k miles, the Extra Cost in using Mobil Super in an engine requires 5 quarts is 30 cents per thousand miles, or 1 penny per 30 miles.
I don't buy oil, dino or synthetic, unless it's on sale (with or without rebate) real cheap. I prefer to buy name brand dino when I can get it for less than $1-1.50 a quart, for synthetic the cut off price is $3 a quart or less. My preferred price is less than everyday price of SuperTech, therefore I never had SuperTech oil in my engines. I did use SuperTech brake fluid.