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8 gallons
7 gallons (28 quarts)
If I remember correctly, I believe oil capacity is 32 qts.
The oil capacity for International 4300 dt466 from 1994 to current hold 30 quarts with filter. Those made before 1994 have smaller engines with the capacity to hold less oil.
The oil capacity is 30 quarts or 7.5 gallons.
30 quarts total for engine & filter capacity
Depends on what engine it has. IIRC, that model could be had with the DT466, DT530, Cummins 6BT, Cat 3116, or Cat 3126 engine.
The oil system on all DTs from '94 to current holds 30 Qts (nominal) including the filter. Some engines do have smaller capacity oil pans, but they are front-sump type pans (4x4 applications I think).
34 quarts
Open the hood, remove the oil cap (where it is exactly depends on which engine it has, which you didn't specify), add oil until the dipstick shows full.
It's takes 7 gallons or 28 quarts. The 4300 is the biggest and the filter alone holds 4 quarts (you must fill the filter with new oil to prime it.) Two 5 gallon buckets help with the extraction/recycling of old oil.
75-90 is used as a default in the diffs of Class 5 - 8 trucks.