Oil changes on a 7.3L are no different than most other vehicles. It is a simple procedure, and can be the best thing you can do for your engine. The engine takes 15 quarts of oil, 13 in the crank case, and 2 in the filter. There are also 3 quarts in the HPOP reservoir, however most people decide not to change this because the oil will mix with the other 15 quarts as soon as the motor is started.
The only time I recommend changing the HPOP oil is if you suspect the oil has gummed up and has become sludge. When this happens it may be necessary to clean out the entire oil system.
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