I'm always suspicious of Mobiloil - Gargoyle stuff.
I couldn't find a previous post on this particular sign on eBay 110826925801

Anyone familiar with this configuration?

15" x 24"

"A grade for each type of motor"

And the seller doesn't ordinarily handle gas and oil items.

Any suggestions appreciated.

That's one of the more common gargoyle signs in my area (Ohio) it looks legit.
I've seen (a grade for each type of motor) (vacuum oil company) and Two others that I can't think of at this time.