EXHIBIT 4.1 EXTENSION AGREEMENT dated as of March 1, 1995, relating to the Competitive Advance and Revolving Credit Facility Agreement dated as of February 16, 1994 (as amended, modified, extended or restated from time to time, the "Credit Agreement"), among ETHYL CORPORATION, a Virginia corporation (the "Company"), the Banks listed in Schedule 2.01 to the Credit Agreement (the "Banks"), CHEMICAL BANK, a New York banking corporation, as administrative agent for the Banks under the Credit Agreement (the "Administrative Agent") and NATIONSBANK, N.A. (CAROLINAS) (formerly known as NationsBank of North Carolina, N.A.), a national banking association, as co-agent (in such capacity, the "Co-Agent"). WHEREAS, the Banks have established a $500,000,000 credit facility for the benefit of the Company pursuant to the terms of the Credit Agreement; WHEREAS, in accordance with the provisions of Section 2.10(d) of the Credit Agreement, upon the consent of Banks holding a majority in amount of the Commitments, the Maturity Date with respect to such consenting Banks will be extended to the first anniversary date of the Maturity Date now in effect; and WHEREAS, the Company has requested an extension of the Maturity Date from February 16, 1999 to February 16, 2000 in accordance with the terms of Section 2.10(d) of the Credit Agreement; NOW THEREFORE, in consideration of the mutual agreements contained in this Agreement and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties hereto hereby agree as follows: SECTION 1. Definitions. Capitalized terms used and not otherwise defined herein shall have the meanings assigned to them in the Credit Agreement. Section 1.02 of the Credit Agreement shall apply to this Agreement. SECTION 2. Extension of Maturity Date. Each of the undersigned Banks hereby consents to the extension of the Maturity Date from February 16, 1999 to February 16, 2000. Upon the consent to such extension by Banks holding a majority in amount of the Commitments, the Maturity Date, with respect to such consenting Banks, shall be extended to February 16, 2000. The Maturity Date shall remain unchanged (a) as to any non-consenting Bank, in the event Banks holding a majority in amount of the Commitments shall consent to such extension, and (b) as to all Banks, in the event that Banks holding less than a majority in amount of the Commitments shall consent to such extension. Failure by a Bank to consent to this extension may give rise to certain rights by the Company to replace such Bank as provided in Section 2.10(d) of the Credit Agreement. SECTION 3. Waiver of Notice Period. Each of the undersigned Banks hereby agrees to waive the 60-day notice requirement set forth in Section 2.10(d) of the Credit Agreement. SECTION 4. Expenses. The Company agrees to reimburse the Administrative Agent for its reasonable out-of-pocket expenses in connection with this Agreement, including the reasonable fees, charges and disbursements of Cravath, Swaine & Moore, counsel for the Administrative Agent. SECTION 5. Counterparts. This Agreement may be executed in two or more counterparts, each of which shall constitute an original but all of which when taken together shall constitute but one contract, and shall become effective as provided in Section 7. SECTION 6. Governing Law. This Agreement shall be construed in accordance with and governed by the laws of the State of New York. SECTION 7. Effectiveness. This Agreement shall become effective as of the date first above written when the Administrative Agent shall have received counterparts of this Agreement which, when taken together, bear the signatures of the Company and Banks holding a majority in amount of the Commitments. IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed by their duly authorized officers as of the day and year first above written. ETHYL CORPORATION by /s/ Charles B. Walker Name: Charles B. Walker Title: Vice Chairman CHEMICAL BANK, acting individually and as Administrative Agent, by /s/ Timothy J. Storms Name: Timothy J. Storms Title: Managing Director NATIONSBANK, N.A. (CAROLINAS), acting individually and as Co-Agent, by /s/ Robert Y. Bennett Name: Robert Y. Bennett Title: Senior Vice President THE BANK OF NEW YORK, by /s/ Alan F. Lyster, Jr. Name: Alan F. Lyster, Jr. Title: Vice President BANK BRUSSELS LAMBERT, NEW YORK BRANCH, by /s/ Eric Hollanders Name: Eric Hollanders Title: Senior Vice President Credit Department by /s/ Craig Hallsteen Name: Craig Hallsteen Title: Vice President CENTRAL FIDELITY NATIONAL BANK, by /s/ Harry A. Turton, Jr. Name: Harry A. Turton, Jr. Title: Vice President BANK OF AMERICA ILLINOIS by /s/ Glenn F. Edwards Name: Glenn F. Edwards Title: Vice President CORESTATES BANK, N.A., by /s/ James P. Richards Name: James P. Richards Title: Vice President CREDIT LYONNAIS ATLANTA AGENCY, by /s/ David M. Cawrse Name: David M. Cawrse Title: Vice President CREDIT LYONNAIS CAYMAN ISLAND BRANCH, by /s/ David M. Cawrse Name: David M. Cawrse Title: Authorized Signature CREDIT SUISSE, by /s/ Craig Name: Geoffrey M. Craig Title: Member of Senior Management by /s/ K. R. Kristinsson Name: Kristinn R. Kristinsson Title: Associate CRESTAR BANK by /s/ Christopher B. Werner Name: Christopher B. Werner Title: Vice President FIRST UNION NATIONAL BANK OF VIRGINIA, by /s/ L. S. Cundiff Name: Leslie S. Cundiff Title: Senior Vice President THE LONG-TERM CREDIT BANK OF JAPAN, LIMITED, NEW YORK BRANCH, by /s/ S. Otsubo Name: Satoru Otsubo Title: Joint General Manager MELLON BANK, N.A., by /s/ James S. Adelsheim Name: James S. Adelsheim Title: Vice President THE MITSUBISHI BANK, LTD., NEW YORK BRANCH, by /s/ J. B. Meredith Name: J. B. Meredith Title: MORGAN GUARANTY TRUST COMPANY OF NEW YORK, by /s/ David B. Common Name: D. Common Title: Vice President PNC BANK, NATIONAL ASSOCIATION by /s/ Gary Tyrrell Name: Gary Tyrrell Title: Vice President ROYAL BANK OF CANADA, by /s/ John Crawford Name: John Crawford Title: Senior Manager SHAWMUT BANK, N.A., by /s/ J. P Raffert Name: John P. Raffert Title: Director SIGNET BANK/VIRGINIA, by /s/ Donald J. Mathews Name: Donald J. Mathews Title: Vice President SOCIETE GENERALE, by /s/ Ralph Saheb Name: Ralph Saheb Title: Vice President SWISS BANK CORPORATION, NEW YORK BRANCH, by /s/ Stephanie W. Kim Name: Stephanie W. Kim Title: Associate Director Merchant Banking by /s/ Nicolas T. Erni Name: Nicolas T. Erni Title: Credit Risk Management TORONTO DOMINION (NEW YORK), INC., by /s/ Debbie A. Greene Name: Debbie A. Greene Title: Vice President WACHOVIA BANK OF NORTH CAROLINA, N.A., by /s/ Christopher L. Fincher Name: Christopher L. Fincher Title: Vice President