What is GM 4718M

Joined
Feb 14, 2009
Messages
358
Location
Kewaunee WI
I know it is for the Corvette and Caddy and I have heard that it is a high temp deposit test but what is required for a oil to pass it.
 
Joined
Aug 30, 2007
Messages
1,784
Location
Bonnyville, AB
13% or better NOACK volatility (GF-4 is 15%). 90% or lower viscosity increase in sequence IIIG (GF-4 is 150%). Piston deposit rating 5.5 or better (scale of 1 to 10, higher is better, GF-4 is 3.5). These are the pieces of data I have on hand. I don't feel like paying the $30 for the full details of it.
 
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