my GMC Sierra T1XX (2019-Present) has high oil consumption, is that normal?

Learn how to diagnose and fix high oil consumption issues in GMC Sierra T1XX (2019-Present). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and allow the engine to cool completely.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace PCV Valve

• Tools Required: Pliers, socket set.
• Remove any covers or components obstructing access to the PCV valve.
• Disconnect the hose attached to the PCV valve and remove the valve using pliers.
• Inspect the valve for clogs or damage; replace it if necessary with a new PCV valve.
• Reassemble by reconnecting the hose and any removed components.

3. Addressing Internal Engine Issues

• Tools Required: Compression tester, leak-down tester.
• If compression or leak-down tests reveal issues, consider replacing piston rings or valve seals.
• To replace piston rings, the engine will need to be disassembled.
  • Remove the engine from the vehicle if necessary.
  • Disassemble the engine block, removing the cylinder head, and piston assembly.
  • Replace old piston rings with new ones, ensuring proper orientation and lubrication.
  • Reassemble the engine following manufacturer torque specifications.

4. Clean or Replace Oil Filter

• Tools Required: Oil filter wrench, catch basin.
• Remove the oil filter using the oil filter wrench and allow any residual oil to drain into the catch basin.
• Inspect the old filter for signs of metal shavings or blockages.
• Install a new oil filter, ensuring it is properly lubricated and tightened.

5. Change Engine Oil

• Tools Required: Wrench set, oil catch pan.
• Drain the old oil from the engine by removing the oil drain plug and allowing it to fully drain into the catch pan.
• Replace the drain plug and tighten to manufacturer specifications.
• Fill the engine with new, manufacturer-recommended oil type and viscosity, ensuring the correct amount is added.