FOURTH SUPPLEMENTAL INDENTURE

FOURTH SUPPLEMENTAL INDENTURE (this Fourth Supplemental Indenture), dated as of December 6, 2006, among NewMarket Corporation, a Virginia corporation (NewMarket), each of the guaranteeing subsidiaries listed on the signature pages hereto (the Guarantors) and Wells Fargo Bank, National Association, as trustee under the Indenture referred to below (the Trustee).

W I T N E S S E T H:

WHEREAS, Ethyl Corporation, a Virginia corporation (Ethyl), has heretofore executed and delivered to the Trustee an indenture, dated as of April 30, 2003 (the Initial Indenture), providing for the issuance of 8 ⁷/8% Senior Notes due 2010 (the Notes); and

WHEREAS, pursuant to an Agreement and Plan of Merger, dated as of March 5, 2004 (the Plan of Merger), by and among NewMarket, Ethyl and Ethyl Merger Sub, Inc., a wholly-owned subsidiary of NewMarket, NewMarket became the holding company for Ethyl effective as of June 18, 2004; and

WHEREAS, pursuant to the Supplemental Indenture, dated as of June 18, 2004 (the First Supplemental Indenture), among NewMarket, Ethyl, the Guaranteeing Subsidiaries (as defined therein), the other Guarantors named on the signature pages thereto and the Trustee, NewMarket agreed to assume all of Ethyls obligations under the Indenture and the Notes; and

WHEREAS, NewMarket, Afton Chemical SPRL, a socit prive responsibilit limite organized under the laws of the Kingdom of Belgium and an indirect wholly-owned subsidiary of NewMarket (Afton Chemical), and the Trustee executed and delivered a Second Supplemental Indenture, dated as of July 1, 2004 (the Second Supplemental Indenture), pursuant to which Afton Chemical agreed to become a Guarantor; and

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