Chevrolet Certified Service
Bud Clary Chevrolet services Duramax diesel engines in the Silverado 1500, Silverado HD, Tahoe, Suburban and Silverado chassis cab work trucks, using genuine GM parts and GM's own diesel maintenance schedule. Book oil and fuel filter service, DEF and exhaust diagnosis, and warranty repairs with our Certified Service team at 1030 Commerce Ave.
Heavy duty
In the Silverado 2500HD and 3500HD and Silverado chassis cabs. The 2026 Silverado HD version makes 470 hp and 975 lb-ft through an Allison 10-speed automatic.
Light duty
In the Silverado 1500, Tahoe and Suburban, with 305 hp and 495 lb-ft through a 10-speed automatic.
Coming for 2027
The 2027 Silverado HD, arriving late 2026, moves to an all-new 8.3L Duramax with 555 hp and 1,230 lb-ft.
The time to find a diesel problem is in our shop, not halfway up a mountain pass with a trailer behind you.
These come from GM's 2026 Duramax engine supplements. Towing, dusty roads, off-road use and biodiesel call for service more often.
| Item | 6.6L Duramax V8 | 3.0L Duramax I-6 |
|---|---|---|
| Engine oil | API CK-4 or CJ-4, SAE 15W-40 (5W-40 below 0 F) | dexosD, SAE 0W-20 |
| Oil change | When the oil life system calls for it, within 600 miles of the message, and at least once a year | Same as the 6.6L |
| Fuel filter | Every 22,500 miles or 2 years, or at the CHANGE FUEL FILTER message | Every 30,000 miles or 2 years, or at the message |
| Coolant | DEX-COOL drain and fill every 150,000 miles or 6 years | Same as the 6.6L |
| Diesel Exhaust Fluid | Check the DEF level at every fuel stop. Use ISO 22241 or API-certified DEF. The tank holds 7 gallons. | Check at every fuel stop. Use ISO 22241 or API-certified DEF. |
Source: GM 2026 Duramax Diesel 6.6L and 3.0L engine supplements. Your vehicle's own owner's manual has the final word.
A Duramax warns you about Diesel Exhaust Fluid well before it runs out, at about 500 miles, 300 miles and 75 miles of range. If you keep driving after the Very Low warning, the truck limits its speed to 65 mph, then 55 mph, then 5 mph. Adding at least 2 gallons of DEF clears the limit.
The diesel particulate filter cleans itself about once per tank. Idling and short trips keep it from finishing, so when the message appears, drive steadily at highway speed for up to 30 minutes. If a WATER IN FUEL message stays on after you refuel, the fuel filter needs draining and the tank may need to be purged.
A lot of our customers tow, and around Longview that means hills and mountain grades, often in rain, ice or snow. That is exactly the work GM's severe-service schedule was written for. On the Silverado 1500 and Silverado HD it means changing the transmission fluid and filter every 45,000 miles, along with more frequent fuel and air filter checks. See transmission service for what that involves.
Running a fleet? Our commercial and fleet team has dedicated sales and service staff for trucks that earn a living.
Dustin Schuler, Marketing Director, Bud Clary Auto Group
Why GM recommends it: GM builds the Duramax maintenance schedule around the work these trucks do. A truck towing up a grade in January works a lot harder than one cruising down I-5, and the oil life and fuel filter reminders are how the truck tells you it needs attention.
Why we recommend it: Around here, diesel trucks earn their keep. People tow campers toward Mount St. Helens, boats down to the river and equipment over the passes, in rain, ice and snow. That's hard work for a fuel system and an exhaust filter, and it's exactly when you don't want a warning light.
What happens if you skip it: You find out on a hill with a trailer behind you. A fuel filter or DEF problem that was simple in the shop becomes a truck in reduced power on the shoulder, with a tow bill on top of the repair.
Diagnostics carry a fee, and it goes toward the repair bill if you choose to go ahead. Every job is quoted and approved by you before we start.
Our free shuttle can drop you off when you leave your vehicle and pick you up when it's ready.
On 2026 Chevrolets, Duramax diesels carry a 5-year / 100,000-mile Powertrain Limited Warranty, longer than the 5-year / 60,000-mile coverage on most gas engines. It includes diesel parts such as the DEF tank and injector, NOx sensors, the particulate filter, glow plugs and the fuel filter assembly. The 3-year / 36,000-mile New Vehicle Limited Warranty covers the rest of the truck.
Any qualified shop can do your maintenance, but warranty repairs have to be done at a GM dealer like Bud Clary Chevrolet. Keep your service records either way.
“a problem with the DEF tank on my 2016 GMC. Bud Clary found the problem”
Three oil changes, three tire rotations and three multi-point inspections for your Duramax. Some exclusions apply; see service specials for details.
When the oil life system says so. GM says to change the oil within 600 miles of the CHANGE ENGINE OIL SOON message and at least once a year, and to check the oil level and oil life every 7,500 miles.
API CK-4 or CJ-4, SAE 15W-40, or 5W-40 below 0 F. The 3.0L Duramax uses dexosD 0W-20 instead.
Every 22,500 miles or 2 years on the 6.6L and every 30,000 miles or 2 years on the 3.0L, or sooner if the CHANGE FUEL FILTER message comes on. Biodiesel, dust and heavy towing call for changing it more often.
After the Very Low warning, the truck limits its speed to 65 mph, then 55 mph, then 5 mph. Adding at least 2 gallons of certified DEF clears the limit.
Drive steadily at highway speed for up to 30 minutes so the filter can clean itself. If the message stays on, book service.
No. Any qualified shop can do maintenance, so keep your records. Warranty repairs have to be done at a GM dealer, and we are one.
GM allows blends up to B20. Higher blends are not approved, and biodiesel calls for changing the fuel filter more often.
Yes. Our free shuttle can drop you off when you leave your vehicle and pick you up when it's ready. There's no charge for it.