GMC Workshop Service and Repair Manuals

Engine Oil: Specifications

Type.....................................................................................................................................................................................................................................SG
CAPACITY, Refill:                                           
6-cyl. 292 eng....................................................................................................................................................................................4.7 Liters     5.0 Quarts 
8-cyl. 350..........................................................................................................................................................................................3.8 Liters     4.0 Quarts 
8-cyl. 454........................................................................................................................................................................................4.8* Liters    5.0* Quarts
8-cyl. 454..........................................................................................................................................................................................5.7 Liters     6.0 Quarts 
*1986 K30, -35 pickup only.  Capacity shown is without filter.  When replacing filter, additional oil may be needed
1986:
Above 40°F (4°C).................................................................................................................................................................................................................30
Above 20°F (-7°C).......................................................................................................................................................................................................20W-20
Above 10°F (-12°C).....................................................................................................................................................................................................15W-40
Above 0°F (-18°C).....................................................................................................................................................................................................10W-30*
Below 60°F (16°C)........................................................................................................................................................................................................5W-30
1987:
Above 40°F (4°C).................................................................................................................................................................................................................30
Above 0°F (-18°C).....................................................................................................................................................................................................10W-30*
Below 60°F (16°C)........................................................................................................................................................................................................5W-30
*Preferred