I've been buying (5W-20/30) from Walmart, in the 5qt jugs. Yeah, I end up with part of the second jug laying around, but I can get it for like $36/5qt that way, or $72 for 10 qts, versus your $50/6qts. It amazed the crap out of me, but I have done it 3x, across almost a year, and Walmart consistently was MUCH cheaper than anyone else for PUP.
Check them out, but also just check the 5QT jugs versus the single qts. I did the math, and the "extra" 2 qts (I was seeing like $14/qt) I needed over the single 5qt jug was almost as much as the entire 5qt jug, anywhere. Then Walmart was just cheaper than anyone else I looked at.
They also have supplied my Royal Purple filters, as again, they were cheaper than anywhere else I looked. So my filter, and minimum of 1 5 qt jug, gets me free shipping, with out having to use the Wife's walmart+. (Math I did says I can do on every like 3rd change, only one 5qt jug, and still keep my full 7 qts in the engine of my 4th gen.)
Why are you running 0-40? Most people say 5-20 is too thin, and wouldn't 0-40 be thinner most of the time?