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V � <br /> Lubrizol <br /> August 12, 2011 <br /> Mr. Tim Hurlocker <br /> Costco Wholesale <br /> 999 Lake Drive <br /> Issaquah, WA 98027 <br /> Mr. Hurlocker: <br /> Lubrizol is a specialty chemical manufacturer making additives that are commonly <br /> used in fuels and lubricants. UltraZol 9888 and UltraZol 9888C are two of the <br /> available gasoline additives. These additives are based on chemical components <br /> that are already widely In use in the gasoline market today. Lubrizol routinely <br /> performs material compatibility testing on the components of these formulations and <br /> some of the base formulations. This work includes testing materials that are <br /> commonly used in systems that handle additives and fuels. Metals, such as: <br /> brass, copper, aluminum, steel and stainless steel, as well as, elastomers such as: <br /> Viton, Ryton and Teflon, are included in these programs. <br /> Based on this work and our experience, Lubrizol is confident in the compatibility of <br /> UltraZol 9888 and UltraZol 9888C with the materials found in commonly used valves <br /> and piping used in gasoline additive applications. <br /> Best regards, <br /> Keith Corkwell <br /> Regional Business Manager <br /> Fuels, Refinery 8 Oilfield Products <br /> KCO/rwa <br /> The Lubnzot Corporation <br /> 29400 Lakeland Boulevard <br /> %VwWlBe,OH 44092-2298 <br /> l elephone:440.943.4200 <br /> wv Ajbrizolx m <br />