EXHIBIT 12 PENNZOIL COMPANY AND SUBSIDIARIES COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES For the three months ended March 31, ---------------------------------- 1998 1997 ------------- ------------- (Dollar amounts expressed in thousands) Net income $ 9,658 $ 57,551 Income tax provision Federal and foreign 2,320 29,197 State (20) 3,440 ------------- ------------- Total income tax provision 2,300 32,637 Interest charges 48,346 42,730 ------------- ------------- Income before income tax provision and interest charges $ 60,304 $ 132,918 ============= ============= Fixed charges $ 50,377 $ 49,355 ============= ============= Ratio of earnings to fixed charges 1.20 2.69 ============= ============= DETAIL OF INTEREST AND FIXED CHARGES For the three months ended March 31, ---------------------------------- 1998 1997 ------------- ------------- (Expressed in thousands) Interest charges per Consolidated Statement of Income which includes amortization of debt discount, expense and premium $ 43,911 $ 43,743 Add: portion of rental expense representative of interest factor <F1> 6,466 5,612 ------------- ------------- Total fixed charges $ 50,377 $ 49,355 Less: interest capitalized per Consolidated Statement of Income 2,031 6,625 ------------- ------------- Total interest charges $ 48,346 $ 42,730 ============= ============= <FN> <F1> Interest factor based on management's estimates and approximates one-third of rental expense. </FN>