I'm switching over to Mobile 1 0w-40 full synthetic for everything:
Hyd roller Pontiac V8
Flat tappet BBC
Flat tappet 4.0 Jeep
Hyd roller LS (6.0 vortec, L96 in my 2500HD).
The M1 0w-40 has plenty of zinc for the flat tappet cams, good cold starts, thick enough to beat on during the summer heat, and you can get it pretty cheap in the 12 quart "bag in a box" from Walmart.
I hate having a bunch of different half-empty bottles of oil of different brands and grades on the shelf, this just makes life easier.
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