15W40 oil brand

["Scott McMullan" <mcmullan@xxxx>]

I was looking through a local Pep Boys store the other day, and had a
difficult time locating 15W40 oil. As it turns out, they only seem to carry
one brand of that weight, and only in gallons. I've never heard of this oil
brand (began with an R, forget the full name). The package had a yellow
shell on it, so I wonder if maybe the oil is actually produced by Shell Oil,
and distributed under a strange name?

While I know there are many conflicting ideas about what kind of oil to use
in the PRV, I was wondering if anyone had a strong opinion one way or
another about using an oddball oil brand, as opposed to the better known
ones.

I had no trouble finding the GTLMA fluid for my clutch, which was nice to
see.