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MetroMPG · 11-25-2007, 12:59 PM

It's been a while since I could buy 0w20 around here, and my remaining closest choices are:

For optimal FE, which should I get? Keep in mind that this will be the Blackfly's "winter" oil.

I'm thinking: 5w20 because:

the block heater will be plugged in before most cold starts, so the lower number (0 or 5) is less important than the higher number
20 is less viscous than 30 = more energy savings

Have I got that right?

11-25-2007, 12:59 PM	#1 (permalink)
MetroMPG Batman Junior Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 22,527 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 54.46 mpg (US) Even Fancier Metro - '14 Mitsubishi Mirage top spec 90 day: 70.75 mpg (US) Appliance car Mirage - '14 Mitsubishi Mirage ES (base) 90 day: 62.14 mpg (US) Thanks: 4,078 Thanked 6,976 Times in 3,612 Posts	Oil weight question: 0w30 or 5w20? It's been a while since I could buy 0w20 around here, and my remaining closest choices are: 0w30 5w20 For optimal FE, which should I get? Keep in mind that this will be the Blackfly's "winter" oil. I'm thinking: 5w20 because: the block heater will be plugged in before most cold starts, so the lower number (0 or 5) is less important than the higher number 20 is less viscous than 30 = more energy savings Have I got that right? __________________ Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata Honda mods: Ecomodding my $800 Honda Fit 5-speed beater Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage. Ecodriving test: Manual vs. automatic transmission MPG showdown EcoModder has launched a forum for the efficient new Mitsubishi Mirage www.MetroMPG.com - fuel efficiency info for Geo Metro owners www.ForkenSwift.com - electric car conversion on a beer budget