Yup, i've seen i think its been there for quite some time around these parts. Speaking of walmart.. When i was there the other day, Pennzoil platinum was only $3.97, close to $2 less than M1.
I am currently running Syntec 5w20 in our Miata. Very happy with it's performqnce so far, thinkig about doing an UOA after a couple OCI's. Have to figure out how to post it on this website though...
Generally, 5W-20s have group III in them to compensate for being on the thin-side. That's why I like blending stout 15W-40s with the 5W-20s. Two great oils blended make for a superior dino. (where 5W-20 is not specified).