Decided to send in a sample on both my 2004's (Dmax & Tahoe). For grins I also checked these using the little prestone hand tool with the floating balls. This truck only floated 3 of the 5, but according to the report is in much better shape.
Note the capacity is 24 quarts, not gallons as listed by OAI.
Note the capacity is 24 quarts, not gallons as listed by OAI.