I had blamed oil filters for this before. I guess it wasn't the lowly PF48E that was giving me fits (to be fair, it's happened some with the Mobil 1 filter also). I guess I'm back to the OEM PF48E that is the OE filter and cheaper. I had really thought this filter was the problem, however, this bulletin describes my situation to a "T". Only difference is the onset seems to be a little later. Maybe this applies to you as well:
# 01-06-01-028C: Engine Knock on Cold Start - (Apr 5, 2016)
Subject: Engine Knock on Cold Start
Models: 1999-2006 Chevrolet and GMC C/K Pickup and Utility Models
2002-2016 Cadillac Escalade Models
2007-2013 Chevrolet Silverado
2014 Chevrolet Silverado 1500
2015-2016 Chevrolet Silverado, Suburban, Tahoe
2007-2013 GMC Sierra
2007-2014 GMC Yukon Denali, Yukon XL Denali
2014 GMC Sierra 1500
2015-2016 GMC Sierra, Yukon Models
Equipped with 4.8L, 5.3L, 6.0L or 6.2L Gas Engine
Attention: This Bulletin also applies to any of the above models that may be
Export vehicles.
This Bulletin has been revised to update the Models section. Please discard Corporate Bulletin Number 01-06-01-028B.
Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000 km (12,000-15,000 mi) of use. The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30 seconds (may last longer in extreme cold temperatures). The noise is usually more noticeable on the initial start-up when the temperature is below 10°C (50°F) and may be more pronounced on the first cold start following a long trip.
This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine. THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS.
Important :
At this time, attempts to repair this condition by replacing the engine assembly or pistons are not recommended.
Please share the information found in this bulletin with customers who inquire about this condition. In the event they have additional questions or concerns, please advise your District Manager Aftersales (U.S.) (in Canada, District Manager - Customer Care and Service Process (DM-CCSP)
# 01-06-01-028C: Engine Knock on Cold Start - (Apr 5, 2016)
Subject: Engine Knock on Cold Start
Models: 1999-2006 Chevrolet and GMC C/K Pickup and Utility Models
2002-2016 Cadillac Escalade Models
2007-2013 Chevrolet Silverado
2014 Chevrolet Silverado 1500
2015-2016 Chevrolet Silverado, Suburban, Tahoe
2007-2013 GMC Sierra
2007-2014 GMC Yukon Denali, Yukon XL Denali
2014 GMC Sierra 1500
2015-2016 GMC Sierra, Yukon Models
Equipped with 4.8L, 5.3L, 6.0L or 6.2L Gas Engine
Attention: This Bulletin also applies to any of the above models that may be
Export vehicles.
This Bulletin has been revised to update the Models section. Please discard Corporate Bulletin Number 01-06-01-028B.
Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000 km (12,000-15,000 mi) of use. The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30 seconds (may last longer in extreme cold temperatures). The noise is usually more noticeable on the initial start-up when the temperature is below 10°C (50°F) and may be more pronounced on the first cold start following a long trip.
This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine. THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS.
Important :
At this time, attempts to repair this condition by replacing the engine assembly or pistons are not recommended.
Please share the information found in this bulletin with customers who inquire about this condition. In the event they have additional questions or concerns, please advise your District Manager Aftersales (U.S.) (in Canada, District Manager - Customer Care and Service Process (DM-CCSP)