3.0L Duramax Maintenance Schedule
| Service Procedure | Recommended Interval | Notes/Remarks | |
| Replace engine air filter | 45,000 miles | Or as indicated by "CHANGE ENGINE AIR FILTER" message; check at oil change intervals and replace as necessary | |
| Change engine oil & oil filter | When "CHANGE ENGINE OIL SOON" message is displayed | Replace engine oil at least once per year regardless of miles driven | |
| Replace fuel filter(s) | 30,000 miles or 2 years | Or when "CHANGE FUEL FILTER" message is illuminated; do not exceed 30,000 miles/2 years between fuel filter changes | |
| Replace serpentine belt | As needed | Inspect belt condition at oil change intervals, replace as necessary | |
| Service engine cooling system | 150,000 miles or 5 years | Recommend new radiator hoses, overflow tank cap, and thermostat in addition to replacing the engine coolant | |
| Replace oil pump belt | LM2 | 150,000 miles | Transmission removal required |
| LZ0 | 200,000 miles | ||
| Replace automatic transmission filter & fluid | 45,000 miles under severe service conditions [1] | No normal transmission service interval given, see footnote | |
| Replace transfer case fluid | Normal | 97,500 miles | Replace transfer case fluid immediately if gearbox is submerged; water intrusion probable |
| Severe | 45,000 miles | ||
| Replace front differential fluid | No service interval provided | Replace differential fluid immediately if submerged; water intrusion probable | |
| Replace rear differential fluid | |||
[1] Most vehicles will meet "severe" service criteria at some point, thus we recommend that all vehicles service the transmission at 45,000 mile intervals
3.0L Duramax Service Part Numbers
Updated through 2021 model year
| Part Description | ACDelco/GM Part Numbers |
| Engine air filter | ACDelco A3244C (GM 84121219) |
| Engine oil filter | ACDelco PF66 |
| Oil pan drain plug | GM 55577568 |
| Oil fill cap | --- |
| Fuel filter | ACDelco TP1015 (GM 13539108)(includes seals) |
| Serpentine belt | ACDelco 6K747 (GM 55490583) |
| Belt tensioner | GM 55490609 |
| Glow plug | ACDelco 69G, GM 55490594 |
| Glow plug control module | GM 12687698 |
| Thermostat | --- |
| Thermostat housing | ACDelco 1511130, GM 55503133 |
| Thermostat housing gasket/seal | GM 55496127 |
| Coolant reservoir (primary) | GM 84645616 |
| Coolant reservoir cap | GM 13502353 |
| Coolant reservoir (aux/intercooler) | GM 23394012 |
| Upper radiator hose | GM 84545557 |
| Lower radiator hose | GM 84607471 |
| Coolant reservoir inlet hose | GM 84545561 |
| Coolant reservoir outlet hose | GM 84545538 |
| Turbocharger coolant line (supply) | GM 55492649 |
| Turbocharger coolant line (return) | GM 55506773 |
| Turbocharger coolant line gasket | GM 55490656 |
| Turbocharger oil supply line | GM 55506206 |
| Turbocharger oil line gasket | GM 55493605, 55496919 |
| Turbocharger assembly | GM 55512760 |
| Automatic transmission filter | ACDelco TF937, GM 24294355 |
| Transmission pan gasket | --- |
| Transmission pan drain plug | GM 24233099 |
| Rear differential cover gasket | GM 22943110 |
3.0L Duramax Silverado/Sierra 1500 oil/Fluid Specifications & Capacities
| Type | Oil/Fluid Specification | Capacity [1] | |
| Engine oil | SAE 0W-20 meeting GM dexosD spec Recommend Amsoil 0W-20 Synthetic diesel oil, meets dexosD spec |
7.0 quarts w/ filter change | |
| Engine coolant [2] | GM DEX-COOL extended life engine coolant (orange) ACDelco 10-101 concentrated engine coolant (GM 12346290) ACDelco 10-5027 premixed engine coolant (GM 12378390) |
20.2 quarts | |
| Automatic transmission fluid | GM DEXRON ULV ATF | ~ 13.0 quarts | |
| Transfer case fluid | GM DEXRON VI ATF (ACDelco 10-9243) Recommend Amsoil FE Synthetic ATF |
1.6 quarts | |
| Front differential oil | 75W-85 gear oil (GM 19300457, ACDelco 10-4091) Recommend Amsoil Severe Gear 75W-90 synthetic gear oil |
1.15 - 1.25 quarts | |
| Rear differential oil | 2.1 - 2.75 quarts | ||
| Diesel exhaust fluid (DEF) | ACDelco diesel exhaust fluid 10-4023 [3] | 5.3 gallons | |
[1] Capacities are nominal; always fill to appropriate dipstick marker, fill plug level, or other applicable fluid level indicator. Oil and fluid levels should be verified before and after driving vehicle.
[2] Concentrated engine coolant must be diluted 50/50 with distilled water. Do NOT dilute premixed engine coolant. Cooling system capacity on Express/Savana vans depends on heater configuration and optional equipment.
[3] Or other acceptable diesel exhaust fluid; do NOT attempt to dilute DEF under any circumstances.