[Shotimes] RE: [Shotimes] Driving in -10oF with 10w-30 oil

[Ron Porter]

Dave, it IS true for the bottom number. The base viscosity of the oil is
what it is at the low number, the viscosity modifiers make it act like the
upper number when hot.

10w-30 oil is heavier out of the bottle that 0w-30 oil. When hot, they both
have the viscosity of a 30w oil at a given temp.

>From what I had read back when the 5w-xx oils first hit the scene, the
primary goal was fuel economy through less drag. Better cold-weather
starting lubrication may have been a side benefit, but I doubt that they
care about that anywhere near as much as better economy. Same deal with
ATF-type tranny fluids in manual trannies, as well as thinner differential
lubes.

Ron Porter

-----Original Message-----
From: shotimes-admin@autox.team.net
[mailto:shotimes-admin@autox.team.net]On Behalf Of Dave Kegel
Sent: Sunday, January 26, 2003 2:59 PM
To: 'SHOtimes'
Subject: RE: [Shotimes] RE: [Shotimes] Driving in -10oF with 10w-30 oil


Ron,

This is just not true, although for some reason you keep clinging to it.
The 0w and 5w are COLD flow numbers.  They were not developed for fuel
economy.  They were developed to improve cold weather start up
lubrication.  They are both still 30w oil when warm, so they have the
same fuel economy as the 10w-30w.

Honestly, with your take on oil viscosity, I'm surprised you're not
still running a straight 30w like they did in the 50s.  :)

Dave

-----Original Message-----
From: shotimes-admin@autox.team.net
[mailto:shotimes-admin@autox.team.net] On Behalf Of Ron Porter
Sent: Saturday, January 25, 2003 3:38 PM
To: Steve Tatro; 'SHOtimes'
Subject: RE: [Shotimes] RE: [Shotimes] Driving in -10oF with 10w-30 oil

Remember that the thin oil (0w, 5w) was developed primarily for better
fuel economy.
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