I have used Maxlife in a 4.6 Vic starting at 90k miles. When I would switch to ST or MoCraft oil, consumption would go up. Switching to Maxlife Syn reduced consumption more.
The Vic has 147k miles on it now and consumes about 1qt every 1000-1200 miles. This is very common for older 4.6's. At one point it was consming 1qt/600-800 miles on SuperTech SJ or SL a few years ago.
I put MaxLife Syn in a '95 K1500 350 TBI at 160k'ish miles ( engine regularly saw 4-5k mile dino OCI's before) and no leaks or increased consumption.
Maxlife Dino is 12-18% PAO syn though not marketed as a blend. Good stuff for $11/5qt jug at Wal-Mart.