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The gain is mostly in the thickness when cold.
The 8.* cSt was measured at 100°C.
But even the 0W20 oils have a thickness of more than 40 cSt at 40°C (104°F), that must be over 100 cSt at a cold winter start.
The first digit is more important than the latter. I'd rather use 0W50 than 5W20.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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