A 6.6L Duramax diesel engine typically holds 10 quarts of oil with a filter change.

The 6.6L Duramax diesel engine, found in Chevrolet and GMC trucks, requires 10 quarts (9.5 liters) of engine oil when performing an oil change with a new filter. This capacity applies to most Duramax engines from 2001 to current models, though exact specifications may vary slightly by year and configuration.

Oil Capacity by Duramax Generation

  • LLY/LBZ/LMM/LML (2001-2016): 10 quarts
  • L5P (2017+): 10 quarts
  • 6.6L Diesel (Medium Duty): 10 quarts

Recommended Oil Specifications

Specification Requirement
Viscosity 15W-40 (standard) or 5W-40 (cold climates)
API Rating API CJ-4 or newer
Oil Type Diesel engine oil meeting GM dexosD

Oil Change Process

  1. Drain existing oil completely
  2. Replace oil filter
  3. Add 10 quarts of new oil
  4. Start engine and let run 1-2 minutes
  5. Check oil level and top off if needed

Common Mistakes to Avoid

  • Overfilling beyond 10 quarts
  • Using incorrect viscosity rating
  • Skipping filter replacement
  • Not checking oil level after refill