GMC Duramax Diesel 2015 Owner's Manual page 113

11-10 Service and Maintenance
Usage Fluid/Lubricant
Hood Hinges Multi-Purpose Lubricant, Superlube (GM Part No. 12346241, in
Canada 10953474).
Pickup Models: Body Door Hinge Multi-Purpose Lubricant, Superlube (GM Part No. 12346241, in
Pins, Tailgate Hinge and Linkage, Canada 10953474).
and Fuel Door Hinge
Pickup Models: Tailgate Handle Pivot Multi-Purpose Lubricant, Superlube (GM Part No. 12346241, in
Points, Hinges, Latch Bolt, and Canada 10953474).
Linkage
Weatherstrip Conditioning Weatherstrip Lubricant (GM Part No. 3634770, in Canada 10953518) or
Dielectric Silicone Grease (GM Part No. 12345579, in Canada 10953481).
Weatherstrip Squeaks Synthetic Grease with Teflon, Superlube (GM Part No. 12371287, in
Canada 10953437).