1/4 to 1/8th of a gallon, all factors dependent.
The current API rating for diesel engine oil is CJ.
Diesel #2. During the winter in the states that get regular temperatures in teens and below, you should use diesel #1 because diesel #2 will gell at lower temperatures.
Between four and nine, dependent on a number of factors.
1,000.000.
Depends on which engine it has.
300 to 650hp
The norm will be between 22 and 25 tons.
In the range 2,000 to 2,500
22 to 25 tons, typically.
18 wheeler has the higher gross weight
15W30 and 15W40 are commonly used, oil specifically for diesel engines, and API CJ4 requirements for newer trucks.