The other issue is the tighter tolerances the newer motors are built with, which is another reason they recommend 5w20, everything is roller bearing as far as the valve train goes, so you don't need as much oil mass to pick up the slack in the clearances between moving parts like the old windsor 351s and H.O. 305s
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-Chris
**83 Turbo 280ZX** - Megasquirt 2 v3.0 Stand alone EMS, n42 head swap (8.3:1 cr), n42 intake, 60mm throttle body, z31 watercooled T3, NXS Manual boost controller (12psi) MSD Blaster 2 Coil, Apexi 3" Turboback Exhaust, Exedy Stage 2 Clutch, Greddy Type-S BOV, DNA Motoring FMIC, Walbro 255 Fuel Pump, CX Racing SR20 Radiator, Custom Ram Air Intake, Suspension Techniques Sway Bars, Eibach 2" Pro Lowering Springs, Tokico Blue HP Shocks, Energy Suspension LCA, Subframe, & End link Bushings
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