Vulcans are all the same capacity regardless. It's listed as 4.5 quarts, which is almost right in the middle of the crosshatch area. I've always just put in the whole five-quart jug, which puts it a hair below max.
Jim S. - Pittsburgh, PA
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2011 Ford Fusion SEL - Duratec25/6F35, 31k and counting
2001 Ford Taurus SES - Vulcan/AX4S, 190k and counting
1988 Pontiac Fiero GT - 2.8 V6/Getrag 282
Past: 1993 Taurus GL | 2002 Escort ZX2
Also in the Family: 2010 Fusion Sport | 2001 Toyota Camry LE V6