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Lubr%zaf <br /> March 21, 2011 <br /> Tim Hurlocker <br /> Costco Wholesale <br /> 999 Lake Drive <br /> Issaquah, WA 98027 <br /> Dear Tim: <br /> UltraZol 9888 and UltraZol 9888C are petroleum based products that are used to control <br /> deposit formation in gasoline powered engines. These deposit control additives are required <br /> by the US EPA to be used In all gasoline to keep engines clean for lower emissions and have <br /> been present in all US gasoline since 1997 or earlier. UltraZol 9888 and UltraZol 9888C are <br /> in compliance with all US EPA requirements for deposit control additives and utilize only the <br /> allowed elements: carbon, hydrogen, oxygen and nitrogen. <br /> Sincerely, s <br /> Keith Corkwell <br /> Regional Business Manager <br /> Fuel Refinery R Oilfield Products <br /> Lubrizol Corporation <br /> CC: John Ellingson <br /> SSEM/rrwa <br /> nW Lutx¢ol CnlpeMIM <br /> 294001 nkeland Bot$"rd <br /> Wxmffo,OFI 44092-2298 <br /> Telephone:440.94$.42(X1 <br /> www.1t4xlzol.com <br />