The 3.0 doesn't have a valley or a valley pan or a valley pan gasket. The easiest way to troubleshoot a head gasket is to look at the spark plugs. If any of the plugs are substantially cleaner the the remaining. You have a leaking head gasket. The plugs should be dark brown on the rim and tan or light brown on the center electrode. If one or two are bright and shiny you have a head gasket leak or even worse a cracked block or cracked head.

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2007 Suzuki Vinson 500 4X4
2007 Toro 6.5hp
2006 BMW X5 4.4 ltr (his)
2001 BMW X5 4.4 ltr (hers)
1994 Honda XR650L
1984 Honda XR80

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Benjamin Franklin