I dunno if it's called cheap or smart. Ivery only used RA only once, but will be using it more. On parts I don't need right this minute, I'll buy from them because they're usually ridiculously cheaper than the local parts stores. As for oil, I've been using Rural King full syn,good oil for a great price, a full syn for $2.79 @ qt, how do you beat that? Probably not PU,but far in excess of all specs needed, so why not?
The way I look at it, I can feel good for $2.79 or feel a little better for $5+ @ qt w/ PPPP, and yes I fall for it sometimes.