If you're running an oil change shop, and you have a "don't care" bulk oil cheapo oil change offer, then Service Pro is a possibility. Or, if you have a Pennzoil sign up front to attract more customers, and you pump in Service Pro oil in your Pennz drums at night when nobody's looking, as some unethical dummies do, then again, Serv Pro is your oil!
For all we know, any SN-GF5 oil is all identical anyway, we think.