MUST use 5W30 only.
It looks like the Silverado 1500 can tow 5500 to 7200 Lbs depending on which configuration your truck has.
The 2011 Chevrolet Silverado-3500HD has a V8 engine.
The 2011 Chevrolet Silverado-2500HD has a V8 engine.
The 2011 Chevrolet Silverado-1500 has a V6 engine.
The top speed of a 2011 Chevy silverado ltz 1500 is 97 mph
The 2011 Chevrolet Silverado-1500-Hybrid has a V8 engine.
6x5.5
The 2011 Chevrolet Silverado-1500 has a 4.3 L base engine size.
The 2011 Chevrolet Silverado-3500HD has a 6.0 L base engine size.
The 2011 Chevrolet Silverado-2500HD has a 6.0 L base engine size.
8x180
The 2011 Chevrolet Silverado-3500HD's engine produces 322 hp @ 4400 rpm.