5W30 weight ONLY. Anything heaver will BURN up the valvetrain.
The 2003 Chevrolet Silverado-1500 has a V6 engine.
The 2003 Chevrolet Silverado-2500HD has a V8 engine.
The 2003 Chevrolet Silverado-2500HD has a 6.0 L base engine size.
The 2003 Chevrolet Silverado-1500 has a 4.3 L base engine size.
The 2003 Chevrolet Silverado-2500HD's engine produces 300 hp @ 4400 rpm.
The 2003 Chevrolet Silverado-1500's engine produces 200 hp @ 4600 rpm.
The 2003 Chevrolet Silverado-2500HD's engine produces 360 ft-lbs. @ 4000 rpm.
The 2003 Chevrolet Silverado-1500's engine produces 260 ft-lbs. @ 2800 rpm.
What does reduce engine power means?
The 2003 Chevrolet Silverado-1500 has 12 valves.
The 2003 Chevrolet Silverado-2500HD has 16 valves.
The 2003 Chevrolet Silverado-1500 has overhead valves (OHV).