GMC Sierra 1500 excessive oil consumption of 3 liters between oil changes on GMC Sierra 1500

Some GMC Sierra 1500 owners report experiencing excessive oil consumption, particularly in models like the 2014 and 2012 versions, which show issues after reaching certain mileage thresholds. Newer models, such as the 2020 GMC Sierra 1500 with a 3L Diesel engine, also face similar oil consumption problems, necessitating oil consumption tests and frequent checks of oil levels. Owners of the 5.3 L V8 engine variant have noted the need for oil top-ups between changes, suggesting potential underlying issues with oil usage. Common causes for this excessive consumption include worn piston rings, leading to oil seeping into the cylinders. While General Motors (GM) considers 1 quart of oil consumed for every 2,000 miles acceptable, some drivers have had to replace pistons and rings to resolve the issue. GM has issued service bulletins recommending solutions such as installing an AFM oil deflector and cleaning carbon from the cylinder head to address these concerns. Regular monitoring of oil levels and following maintenance recommendations are essential for mitigating these challenges.