I liked it at the time, but am now phasing out the heavy oils in favor of 5w30 for winter and 10w30 stuff for summer, like the big amount of NAPA synthetic I got in their February sale.
We have brutal heat at times here, but some BITOG folks convinced me the heavy stuff is not needed. Still, around here a lot of folks swear by the heavy stuff and you see tons
of it in the local stores.
That Mobil 1 15W-50 made the engine run smooth and quiet though.