DD in a 7500... oil capacity?

[greywuuf]

got me a 1975 H70 with a 6V53. Seems that straight weight oil is going to be a special trip to purchase at the bulk plant. now that is has been fired up and made a short trip, and got warmed up and circulated good I figured I would start with an oil and filters change. Anyone know right off how much oil this is going to take ? interesting that the dipstick show a 'F" and a "7" ( down a ways assuming this is and ad mark ?)