2009 3500 4X4 Xtended cab SRW. Running 1/2 ounce of Opti-Lube XPD per gallon of fuel.
19MPG, running our 65mph speed limit over all sorts of terrain.
Enthusiast
2009 3500 4X4 Xtended cab SRW. Running 1/2 ounce of Opti-Lube XPD per gallon of fuel.
19MPG, running our 65mph speed limit over all sorts of terrain.
2009 GMC SLT 3500 Xtended Cab 6.6L
Lubricated By Rotella T-6 and Amsoil EAO52 Filter
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