ServlogUpdated 2026-07-11
GMC Sierra 2500HD Oil Change Interval & Oil Type
Compiled & reviewed by Nikolai Tsyrenov · Updated 2026-07-11
When to change the oil on a 2020-2025 GMC Sierra 2500HD, and what oil it takes.
| Oil change interval | GM Oil Life Monitor: ~7,500 mi / 12 mo (many owners ~5,000 mi when towing) |
|---|---|
| Engine / oil | 6.6L L8T V8 gas (primary) or 6.6L Duramax turbo-diesel; full synthetic 5W-30 dexos1 Gen 3 (gas); 6L90 6-speed auto |
| Oil filter | Replace with every oil change |
GMC Sierra 2500HD note: Mechanical twin of the Chevrolet Silverado 2500HD — same 6.6L L8T gas V8 / 6L90 (or 6.6L Duramax diesel / Allison), so the intervals match. GM calls the gas transmission fluid 'lifetime' for normal use, but service it ~every 45,000 mi under towing/plowing/severe duty; the diesel adds fuel filters and DEF on their own schedule. Log service by duty cycle.
FAQ
How often should you change the oil in a GMC Sierra 2500HD?
GM Oil Life Monitor: ~7,500 mi / 12 mo (many owners ~5,000 mi when towing).
What kind of oil does the GMC Sierra 2500HD take?
GMC Sierra 2500HD: 6.6L L8T V8 gas (primary) or 6.6L Duramax turbo-diesel; full synthetic 5W-30 dexos1 Gen 3 (gas); 6L90 6-speed auto. Use the grade and spec listed in your owner's manual or on the oil cap.
Should I use the normal or severe oil-change schedule?
Use the severe-service interval if you mostly drive short trips, in cold/dusty/hot climates, in stop-and-go traffic, or tow — which describes most real-world drivers.
← Full GMC Sierra 2500HD maintenance schedule · Oil change intervals for all cars
General guidance — confirm against your GMC Sierra 2500HD owner's manual.
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