EXHIBIT 12.3 PENNZOIL COMPANY AND SUBSIDIARIES COMPUTATION OF RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS--PRO FORMA FOR THE THREE FOR THE TWELVE MONTHS ENDED MONTHS ENDED MARCH 31, DECEMBER 31, 1998 1997 ------------- -------------- (DOLLAR AMOUNT EXPRESSED IN THOUSANDS) Income from continuing operations........................................................ $ 9,658 $ 180,255 Income tax provision..................................................................... 2,300 124,140 Interest charges......................................................................... 48,346 187,271 -------- --------- Income before income tax provision and interest charges.................................. $ 60,304 $ 491,666 ======== ========= Fixed charges............................................................................ $ 50,377 $ 200,356 ======== ========= DETAIL OF INTEREST AND FIXED CHARGES: Interest charges per Consolidated Statement of Income which includes amortization of debt discount, expense and premium.................................................. $ 43,911 $ 176,891 Add: portion of rental expense representative of interest factor (1)..................... 6,466 23,465 -------- --------- Total fixed charges................................................................. $ 50,377 $ 200,356 Less interest capitalized per Consolidated Statement of Income........................... 2,031 13,085 -------- --------- Total interest charges.............................................................. $ 48,346 $ 187,271 ======== ========= PRO FORMA ADJUSTMENTS-- PREFERRED STOCK-- Preferred dividends................................................................. $ 3,931 $ 15,726 Decrease in interest charges........................................................ 2,205 8,820 REFINANCING OF EXCHANGEABLE DEBENTURES-- Decrease in interest charges........................................................ 4,574 18,658 DISCONTINUED OPERATIONS-- Decrease in income from continuing operations....................................... 5,848 22,756 Decrease in income tax.............................................................. 5,149 20,536 Decrease in portion of rental expense representative of interest factor (1)......... 4,929 18,387 Decrease in net interest charges per Consolidated Statement of Income which includes amortization of debt discount, expense and premium....................... 8,538 31,584 Decrease in capitalized interest.................................................... 255 7,441 RATIO OF EARNINGS TO FIXED CHARGES: HISTORICAL-- Ratio of earnings to fixed charges.................................................. 1.20 2.45 ======== ========= PRO FORMA PREFERRED STOCK AND REFINANCING OF EXCHANGEABLE DEBENTURES-- Ratio of earnings to fixed charges.................................................. 1.27 2.61 ======== ========= PRO FORMA DISCONTINUED OPERATIONS-- Ratio of earnings to fixed charges.................................................. -- 2.70 ======== ========= Amount by which fixed charges exceed earnings....................................... $ 815 -- ======== ========= PRO FORMA PREFERRED STOCK, REFINANCING OF EXCHANGEABLE DEBENTURES AND DISCONTINUED OPERATIONS-- Ratio of earnings to fixed charges.................................................. 1.06 2.93 ======== ========= (1) Interest factor based on management's estimates and approximates one-third of rental expenses.