5W30 in the cold months and 10W30 in the hot months. If you use anything HEAVER then the above you will BURN the roller valve train up.
The 2006 Chevrolet Suburban has overhead valves (OHV).
The 2004 Chevrolet Suburban has overhead valves (OHV).
The 2009 Chevrolet Suburban has overhead valves (OHV).
The 2007 Chevrolet Suburban has overhead valves (OHV).
The 2013 Chevrolet Suburban has overhead valves (OHV).
The 2008 Chevrolet Suburban has overhead valves (OHV).
The 2003 Chevrolet Suburban has overhead valves (OHV).
The 2005 Chevrolet Suburban has overhead valves (OHV).
The 2012 Chevrolet Suburban has overhead valves (OHV).
The 2014 Chevrolet Suburban has overhead valves (OHV).
The 2010 Chevrolet Suburban has overhead valves (OHV).
The 2001 Chevrolet Suburban has overhead valves (OHV).