Chevy Duramax Diesel in Oklahoma: 3.0L, 6.6L and the New 8.3L
Duramax Diesel · OklahomaChevy Duramax diesel in Oklahoma: the 3.0L, 6.6L and new 8.3L, which trucks and SUVs get them, and what’s in stock
Quick answer Chevrolet sells three Duramax diesels: the 3.0L inline-six (305 hp / 495 lb-ft) in the Silverado 1500, Tahoe and Suburban; the 6.6L V8 (470 hp / 975 lb-ft) in the 2026 Silverado 2500HD and 3500HD; and the new 8.3L V8 (555 hp / 1,230 lb-ft) that replaces it in the 2027 HD, which Carter is ordering now. The 3.0L is the fuel-economy diesel (22 / 26 mpg in a Tahoe), the big V8s are the towing diesels (up to 36,000 lb on a 2026 3500HD, 38,000 on the 2027). We have 12 Duramax vehicles on the lot today, every one priced under MSRP with GM’s diesel cash listed on top, no doc fee, free delivery anywhere in Oklahoma.
The three Duramax engines
| Engine | Output | Transmission | Where you get it | Status |
|---|---|---|---|---|
| 3.0L Duramax I-6 (RPO LZ0) | 305 hp / 495 lb-ft | 10-speed automatic | Silverado 1500 (Custom Trail Boss and up; standard on ZR2), Tahoe and Suburban (LT, RST, Z71, Premier, High Country) | Current; 2026 and 2027 model years |
| 6.6L Duramax V8 (RPO L5P) | 470 hp / 975 lb-ft | Allison 10-speed | Silverado 2500HD and 3500HD, all cabs and trims | Final year on the 2026 HD; 10 in stock |
| 8.3L Duramax V8 (RPO L6P) | 555 hp / 1,230 lb-ft | Allison 10-speed | 2027 Silverado 2500HD and 3500HD (all trims on the 2500HD; WT, LT, LTZ and High Country on the 3500HD) | New; production starts November 2026, ordering now |
“Duramax” is GM’s diesel family name, not one engine, and the three current engines have very different jobs. The 3.0L is a light-duty inline-six built for economy and quiet torque; it is the engine you pick in a Tahoe for the highway range, or in a Silverado 1500 because you tow a stock trailer every weekend and want 28 mpg the rest of the week. The 6.6L and 8.3L V8s are heavy-duty engines paired with an Allison 10-speed, an exhaust brake and the cooling and axle hardware to pull a gooseneck across the state. Nobody cross-shops a 3.0L against an 8.3L; the question is which truck you need, and the Duramax follows.
Which Chevy gets which Duramax
Silverado 1500 · 3.0L Duramax
Available on Custom Trail Boss, LT, RST, LT Trail Boss, LTZ and High Country, standard on the ZR2; not offered on WT or Custom. Max towing 13,300 lb with the Max Trailering Package, and EPA-estimated highway fuel economy up to 28 mpg, the best of any Silverado engine. Through November 30 the 2026 1500 carries GM’s 0% for 60 months or $1,250 customer cash plus $2,000 bonus cash on the diesel; the 2027 1500 diesel carries $2,750 bonus cash. Silverado 1500 specials · Is the 1500 diesel worth it?
Tahoe & Suburban · 3.0L Duramax
Available on LT, RST, Z71, Premier and High Country (not LS). EPA-estimated 22 / 26 / 24 mpg (2WD Tahoe) and 21 / 26 / 23 (2WD Suburban). Towing 8,200 lb 2WD or 7,900 4WD on the Tahoe, 8,100 / 7,800 on the Suburban. The diesel is not offered with Super Cruise on Premier and High Country. Full 3.0L page · How far a Duramax Tahoe goes on a tank · Tahoe specials
2026 Silverado 2500HD & 3500HD · 6.6L Duramax
Every cab and trim. 470 hp / 975 lb-ft, Allison 10-speed, exhaust brake. Max conventional towing 22,500 lb on a 2500HD; up to 36,000 lb gooseneck on a 3500HD dually. This is the last model year for the 6.6L, and GM is clearing it with $1,000 customer cash on every 2026 Duramax plus $4,500 Red Tag bonus cash on LT and High Country ($3,000 on LTZ) through November 30. Silverado HD specials
2027 Silverado 2500HD & 3500HD · 8.3L Duramax
The new engine: 555 hp / 1,230 lb-ft, Allison 10-speed, an $11,400 option on any 2500HD trim and on 3500HD WT, LT, LTZ and High Country. Max towing 38,000 lb on a 3500HD regular-cab dually with the Max Trailering Package; 2500HD up to 22,300. Production starts November 2026 and Carter is taking orders now. 2027 Silverado HD pillar · 8.3L Duramax vs. 6.6L gas · 2027 HD towing chart
When the Duramax pays, and when it doesn’t
It pays when the miles are long or the trailer is heavy. A 3.0L Tahoe at 26 highway against a 5.3L at 20 is a 30 percent fuel difference, which on 20,000 highway miles a year is roughly 230 gallons. The HD diesels earn their premium on the trailer: the exhaust brake, the extra cooling, and 975 or 1,230 lb-ft mean the truck is not working at its limit on a 15,000 lb gooseneck in a headwind on I-40, and that shows up in how long the transmission and brakes last. Diesel trucks also hold their resale value noticeably better in Oklahoma than gas trucks do, because the next buyer is usually towing too.
It doesn’t pay when the truck idles around town. Short trips never get the particulate filter hot enough to regenerate on its own, diesel fuel costs more at the pump most of the year, DEF and fuel filters are a real line item, and the option price is $10,000 to $11,400 on an HD. If your 2500HD pulls a 10,000 lb trailer a few times a year and runs errands the rest of the time, the 6.6L gas V8 (401 hp / 464 lb-ft on the 2026; 412 / 472 on the 2027) tows that trailer fine for a lot less. We say that on the Duramax-vs-gas page too, because the gas HD is the right truck for more buyers than the diesel is.
Duramax vehicles in stock at Carter, November 5, 2026
| Stock | Vehicle | Engine | MSRP | Carter price* | GM cash this month |
|---|---|---|---|---|---|
| 30207 | 2026 Silverado 2500 HD LT | 6.6L Duramax (L5P) | $72,100 | $65,265 | $1,000 + $4,500 Red Tag |
| 30508 | 2026 Silverado 2500 HD LT | 6.6L Duramax (L5P) | $77,495 | $70,120 | $1,000 + $4,500 Red Tag |
| 30507 | 2026 Silverado 2500 HD LT | 6.6L Duramax (L5P) | $77,495 | $70,120 | $1,000 + $4,500 Red Tag |
| 30171 | 2026 Silverado 2500 HD LT | 6.6L Duramax (L5P) | $79,240 | $71,691 | $1,000 + $4,500 Red Tag |
| 30520 | 2026 Silverado 2500 HD LT | 6.6L Duramax (L5P) | $79,350 | $71,790 | $1,000 + $4,500 Red Tag |
| 30518 | 2026 Silverado 2500 HD LT | 6.6L Duramax (L5P) | $79,350 | $71,790 | $1,000 + $4,500 Red Tag |
| 30516 | 2026 Silverado 2500 HD LT | 6.6L Duramax (L5P) | $79,350 | $71,790 | $1,000 + $4,500 Red Tag |
| 30208 | 2026 Silverado 2500 HD LT | 6.6L Duramax (L5P) | $79,355 | $71,794 | $1,000 + $4,500 Red Tag |
| 30544 | 2026 Silverado 2500 HD LT | 6.6L Duramax (L5P) | $79,745 | $72,145 | $1,000 + $4,500 Red Tag |
| 30336 | 2026 Silverado 3500 HD LT DRW | 6.6L Duramax (L5P) | $80,450 | $72,300 | $1,000 + $4,500 Red Tag |
| 30350 | 2026 Tahoe LT | 3.0L Duramax (LZ0) | $75,115 | $70,995 | — |
| 30380 | 2026 Tahoe RST | 3.0L Duramax (LZ0) | $81,835 | $76,995 | — |
*Carter price = the listing price today, before GM’s customer cash and bonus cash, which are shown as their own line on each listing; most vehicles have window tint installed and it is listed as its own line. GM cash through November 30, 2026; the $4,500 Red Tag bonus applies to 2026 HD diesel LT and High Country. Plus tax, title and license. No doc fee, no addendum. Inventory changes daily; the listing is the source of truth.
How buying a Duramax from Carter works
- Tell us the job. Trailer weight, miles a year, how long you keep trucks. We’ll tell you which Duramax, or whether the gas engine is the better buy.
- Pick a stock number. Every listing shows MSRP, our discount, GM’s cash and the price you pay. Diesel or gas, the price is the price.
- Finance how you want. GM Financial, your credit union, or cash. Diesel HDs for a business can be financed in the company name; see commercial truck financing.
- We bring it to you. Free delivery anywhere in Oklahoma, paperwork signed at your kitchen table or shop, trade picked up at the same time.
Frequently asked questions
What Duramax engines does Chevy make right now?
Three. The 3.0L Duramax inline-six (305 hp, 495 lb-ft) in the Silverado 1500, Tahoe and Suburban; the 6.6L Duramax V8 (470 hp, 975 lb-ft) in the 2026 Silverado 2500HD and 3500HD; and the new 8.3L Duramax V8 (555 hp, 1,230 lb-ft) that replaces it in the 2027 HD. The 2.8L Duramax four-cylinder that was offered in the Colorado was dropped after the 2022 model year; today’s Colorado is gas-only.
Which Chevy SUVs have a Duramax?
The Tahoe and Suburban, with the 3.0L Duramax, on the LT, RST, Z71, Premier and High Country trims (not the LS). In the SUVs the diesel is mainly a fuel-economy and range engine: EPA-estimated 22 city / 26 highway on a 2WD Tahoe against 15 / 20 for the 5.3L V8. Towing is close to the V8 at 8,200 lb (2WD) or 7,900 lb (4WD); the 5.3L with the Max Trailering Package is the one that reaches 8,400.
How much more does a Duramax cost?
On the 2027 Silverado HD the 8.3L Duramax is an $11,400 option on any trim. On the 2026 HD the 6.6L Duramax was a $9,990 option, which is why the in-stock 2026 diesel LTs on this page sit about $10,000 above their gas twins before GM’s $5,500 of diesel cash this month. On the Silverado 1500, Tahoe and Suburban the 3.0L is priced by trim; the listing shows the exact number on each unit.
Is the Duramax worth it?
If you tow heavy or drive a lot of highway miles, usually yes. The diesel keeps its value better, runs cooler under load, has an exhaust brake on the HD, and in the Tahoe or 1500 gets 25 to 35 percent better highway fuel economy than the gas V8. If you drive short trips in town, rarely tow, and plan to keep the truck fewer than three or four years, the gas engine is the better money. We wrote the long versions for the Tahoe, the Silverado 1500 and the Silverado HD.
Should I buy a 2026 6.6L Duramax now or wait for the 2027 8.3L?
Wait if the 8.3L’s 1,230 lb-ft or the higher 2027 tow ratings (up to 38,000 lb on a 3500HD) are the reason you’re buying. Buy the 2026 now if 975 lb-ft already covers your trailer and you want GM’s November money: $1,000 customer cash on every 2026 Duramax plus $4,500 Red Tag bonus cash on diesel LT and High Country ($3,000 on LTZ), on trucks already priced under MSRP. The 2027 trucks start production in November 2026 and will carry whatever GM’s program is at delivery, not today’s cash.
What does a Duramax need for maintenance that a gas engine doesn’t?
Diesel exhaust fluid (DEF) every few thousand miles, a fuel filter on a schedule, and a diesel-specific oil. The 3.0L and 6.6L both have a diesel particulate filter that regenerates on its own if the truck gets regular highway miles; a diesel that only ever idles around town will ask for manual regens. Our service department in Okarche does all of it, and we stock DEF.
Do you have Duramax trucks in stock in Oklahoma?
As of November 5, 2026, 12: 10 2026 Silverado HD Duramax pickups (2500HD LT crew cabs and a 3500HD LT dually) and two 2026 Tahoe diesels (an LT and an RST, both 4WD). The table on this page lists every one with its price. We can also locate or order a diesel Suburban or Silverado 1500 in the configuration you want.
Do you deliver a Duramax truck anywhere in Oklahoma?
Yes. Free delivery on any purchase, anywhere in the state: Tulsa, Lawton, Enid, Stillwater, Guthrie, Woodward, Ardmore or your ranch road. Trade value, credit application and signing all happen remotely if you want them to, and our price is the same whether you drive to Okarche or not.
More on the Duramax
- 3.0L Duramax in the Tahoe, Suburban and Silverado 1500: towing, mpg, which trims get it
- Duramax Tahoe range: how far it goes on a tank
- 2027 Silverado HD: 8.3L Duramax vs. 6.6L gas
- 2027 Silverado 2500HD & 3500HD: pricing, release date, what’s new
- 2027 Silverado HD towing capacity, every configuration
- 2026 Tahoe: is the diesel engine worth it?
- 2026 Silverado 1500: is the Duramax worth it?
- Silverado HD specials this month · Tahoe specials · Silverado 1500 specials
Horsepower, torque, towing and fuel-economy figures are General Motors’ published figures from the 2026 and 2027 order guides and chevrolet.com; towing maximums apply to properly equipped vehicles and vary by cab, drive, axle and package. Fuel economy is EPA-estimated; your mileage will vary. GM incentives referenced are GM programs valid through November 30, 2026. Carter Chevrolet charges no documentation fee and no dealer addendum.
Want the diesel number and the gas number side by side?
Send us a trailer weight and a trim. You’ll get two stock numbers back, same cab, same trim, one Duramax and one gas, with the price, the payment and what each one tows, and we’ll deliver whichever one you pick.