How does an oil qualify for 0w status?

Status
Not open for further replies.

Patman

Staff member
Joined
May 27, 2002
Messages
22,026
Location
Guelph, Ontario
Is it just being lower than a certain cold cranking spec that allows an oil to qualify for 0w status or are there other factors? What does a 0w oil have to achieve in terms of it's cold cranking specs? And is it at -30 or -35c with the new SL formula changes?
 
Joined
Nov 15, 2002
Messages
8,937
Location
SC
quote:
Originally posted by Jay: For the 0w designation the motor oil must have a hot kinematic viscosity of 3.8 cSt @ 100*C or greater to start with. Then it must have a cold temperature pumping viscosity of less than 60,000 cP at -40*C and a cold cranking viscosity of less than 6,200 cP @ -35*C with no yield stress.
The 3.8 cSt @ 100°C would be for a straight 0w oil. For a 0w30, the vis at 100°C would need to be between 9.3 and 12.49 cSt.
 

Jay

Joined
Jul 16, 2002
Messages
1,613
Location
Idaho Falls, ID
Are you sure, G-Man? For example, a 20w-20 designation is possible but not a 25w-20 because of the minimum kinematic viscosity requirement of 25w. [ May 01, 2003, 12:10 AM: Message edited by: Jay ]
 
Joined
Nov 15, 2002
Messages
8,937
Location
SC
quote:
Originally posted by Jay: Are you sure, G-Man? For example, a 20w-20 designation is possible but not a 25w-20 because of the minimum kinematic viscosity requirement of 25w.
Yes, I'm sure. A 0w30 would need to have the cold cranking and puming vis of a 0w oil, and the high temp vis of a 30 weight.
 
Status
Not open for further replies.
Top