Methodology guide
Limits, disposal notes, and when to stop shopping this ladder.
Calculator
Oil drain pan capacity calculator
Enter sump quarts and oil-change jobs. Get required gallons ((qt÷4)×jobs) and an 8 / 15 / 20 gal class or NO_MATCH. Leave headroom; dispose waste oil legally.
Result
Required = (sump_qt ÷ 4) × jobs. Worked check: 5 qt × 4 jobs = 5 gal → 8 gal class. Leave headroom; confirm live capacity.
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