Owner's Manual
Page 274
... from 0 to 1 5/8 inch (40 mm) below the bottom of the filler plug hole. See Recommended Fluids and Lubricants on page 6-4. If you have the 1500 Series, the proper level is from 5/8 inch (15 mm) to 1/4 (6 mm) below the bottom of the filler plug hole. Add only enough fluid...
... from 0 to 1 5/8 inch (40 mm) below the bottom of the filler plug hole. See Recommended Fluids and Lubricants on page 6-4. If you have the 1500 Series, the proper level is from 5/8 inch (15 mm) to 1/4 (6 mm) below the bottom of the filler plug hole. Add only enough fluid...