I haven't done this for several years now, *but*: back in the "bad ol' days" before I found BITOG, did it for a while in the Neon. I was changing oil at 3K, racking up about 750-900 miles a week at the time.
Remember, this was pre-BITOG. I used 3 to 3 1/2 qts conventional, i to 1 1/2 qt "synthetic". Yes, "synthetic".
I didn't know any different at the time, & thought synthetic meant synthetic.
I'll give you three guesses as to what brand it was, & the first two don't count. (Hint: what brand convinced a judge, who knew zip about motor oil, that Group III oil should be called synthetic?)
It worked OK, but probably no better than the same brand's "synthetic" blend did. I did no OA back then, & so have nothing to compare it to.
If I were to do it now, I'd use something known to be a real PAO or Group V synthetic, and probably use 2 qts synthetic to 3 qts dino. JMO.