I use Napa premium performace 10w-40 in everything I own. I suppose the determining factor for needed viscosity is the condition of your engine, if the cam bearings are worn, use heavier oil to boost oil pressure, if in good shape, use the 10-40, at least that's my theory.
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Ol' Buck: '72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84
ralleys and 31/10.5s
Angel girl: 67 Cutlass convertible
330, 3spd stick
Greener: 90 GMC Jimmy
350/auto
Chad Stephens
Orleans,NE
no name yet: 72 442 under serious construction
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option
00 Dodge 2500 4x4, 24V cummins, 5 speed
Chad
South Central Nebraska
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