All 3 have the same weight at operating temps.
None would protect any better than the other with the lower "initial" weight multi-grades even flowing a little better at startup. True, but if you are gonna stretch your oil over a few more miles, my money is on the lower spread oil to keep its rated warm viscosity the longest. Thats why i don't use 5W30, even in Canada. Might consider it in winter, but not in summer.
Marco Tatta
98.5 SE MTX, Duratec
EGR block, fog light
fix, custom shift boot, monsterflow intake, Ecotek valve
Quasi dual cardoctor exhaust.
Hacksaw short shift, Momo race "s" carbon knob, ghetto rear strut bar, 16 inch cougar wheels with 225/50/16 kumho 712s
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