Hiya Glen,

Here's about the only current GM TSB that goes with your criteria...

#00-06-01-025A - Info - Correct Oil Viscosity and Oil Filter Usage for the Duramax 6600 Diesel Engine (RPO LB7) (09/14/2001)

Models: 2001-2002 Chevrolet Silverado and GMC Sie... Login to read more.