Here's some info you didn't ask for...
Motor Oils - Fuel Economy vs. Wear
Many will say newer engines are tighter and thus require thin oil... Sp here's a quick comparison of two oil clearance specs for a 1990 LS400 V8 and the 2008 Tundra V8. Both use an aluminum block. Check out the max limits for both engines, note the pistons! draw your own conclusions.
Main bearing oil clearance
LS400 standard all journals .0010 - .0018
Tundra standard journals 1 and 5 .0007 - .0012
standard journals 2, 3, 4 .0010 - .0015
LS400 max clearance limit .0022
Tundra max clearance limit .0024<-----!!!!!
Piston to cylinder wall clearance
LS400 standard .0008 - .0016
Tundra standard .0019 - .0028
LS400 wear limit .0024
Tundra wear limit .0152<------!!!!