Info should be on the drivers side door jam if not call your local dealer with year make model and the service department should be able to give you this info.
The max towing for the 2011 Super Duty is 24,500 pounds when properly equipped.
10000 Lbs @ 2500 rpm
With a 3.73 axle ratio and heavy duty oil & transmission coolers, the Towing Capacity is 6,500 lbs in the 4WD model.
4000
http://en.wikipedia.org/wiki/Chevrolet_Silverado The 3500 is a Heavy Duty truck by default, towing capacity should be over 16k pounds.
The towing capacity of a 1988 3500 Chevy 1 ton truck is close to 10,000 pounds. The trucks are heavy-duty trucks.
The max towing would be 24,000 pounds. That's class-leading, and the 2011 can haul ASS. 25,000 pounds. That beats GM by 4,000 pounds and Dodge by 6,000 pounds...
light duty 1500 lbs or so
That depends on which engine is in it. If it is the 6.0 Powerstroke diesel, the oil capacity is 15 quarts.
818 kg
Towing a small car via a truck is not suggested due to the small towing capacity of a these trucks. The best way to tow it is to use a tow bar which will allow you to create a towing bar for them.
if it is a 6.0 l diesel engine, it is 15 liters