One could always check with Shell or the other majors and see what requirements they're looking for. I do know that for Mobil/Esso up here, one distributor focuses more upon the oil, and the other more upon fuel. I believe the oil guy does some fuel, but the fuel guy does no oil, if I have it straight. Petro-Canada on the other hand is one distributor doing the whole bit. Shell does, in Canada, have separate Shell (i.e. Formula Shell/Rotella) and full line (Pennzoil-Quaker State/Formula Shell/Rotella) distributors. I don't know how picky they are about fuel. I, too, would agree with your reluctance to distribute fuel. That turns what could be a relatively small operation into a much larger one, with significantly higher overhead. A climate controlled large shed/small warehouse to store oil and a delivery vehicle is a lot different than a cardlock facility, pumps, tanks, and fuel trucks, plus the lubricant distributorship.
It's worth a check, particularly if there are a few bulk fuel distributors there but not much in the way of lube distributors. It wouldn't be out of the realm of possibility, at all, for there to be a relatively small operation with a relatively small warehouse dealing with walk in buys and supplying a few shops. There was something like that here, multi-brand mind you, along with a few filters and other assorted automotive fluids, until the land got bought up. I was asked if I had interest in taking over the operation, but my properties aren't really suitable for such a thing, unfortunately, and I don't have the time. Of course, that bugs me, because what BITOGer wouldn't want his own giant oil stash?