If its an 0811 it should have the Ford 110 engine. According to the Ford Cargo Workshop Manual, the re-fill capacity is 14 litres if it has a front well or 14.6 Litres if it has a rear well. If the oil cooler (if you have one) was drained as well (there is a drain plug on the underside of it) - add another 0.7 Litres.
Good idea to put some clean oil into the filter before screwing it on - helps to build up oil pressure sooner when you re-start.
Make sure truck is on level ground when checking dipstick!
Overfilling the engine with oil can be almost as bad as underfilling it.
JD
October 2008