1 EXHIBIT 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our report dated February 29, 2000, included in this Form 10-K, into Pennzoil-Quaker State Company's previously filed Registration Statements on Form S-8 Nos. 333-69833, 333-69835, 333-69839, 333-69837, 333-72835, 333-96385 and on Form S-3 No. 333-65909. ARTHUR ANDERSEN LLP Houston, Texas March 3, 2000