2018 GMC Sierra Denali Engines

2018 GMC Sierra Denali Engine Assembly (389 parts in stock)
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Engine Assembly (Not Actual Photo)
Summary
Year: 2018change
Make: GMCchange
Model: Sierra Denalichange
Sub Models: Basechange
Item: Engine Assembly
Condition: OEM Used
Items Available: 389
Price Range: $2,219 - $12,260 (before local discount)
Local Discount: Up to $100.00
Returns: Cancellation & Return Policy
Item: Engine Assembly change
Condition: OEM Usedchange
Items Available: 389
Price Range: $2,219 - $12,260 (before local discount)
Local Discount: Up to $100.00
 Quality Tested Parts
 Nationwide Shipping
 1-year warranty
 Low Price Guarantee
 30-Day Free Returns

Select the right Engine/Motor for your 2018 GMC Sierra Denali

This part may have multiple fitment options depending on your vehicle's engine, drivetrain, and configuration. To ensure proper compatibility, please select the correct fitment below. If you’re unsure, we strongly recommend checking your VIN or vehicle build details before ordering. You can update or change the fitment selection at any time.

Engine/Motor - SIERRA DENALI 1500 5.3L (VIN C, 8th digit, opt L83)
Select FitmentThis fitment option is for 2018 GMC Sierra Denali opt L83) with 5.3L Naturally Aspirated Gasoline engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is C. Built to meet Federal (EPA) emissions standards.
Items in stock: 169
Engine/Motor - SIERRA DENALI 1500 6.2L (VIN J, 8th digit, opt L86)
Select FitmentThis fitment option is for 2018 GMC Sierra Denali opt L86) with 6.2L Naturally Aspirated Gasoline engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is J. Built to meet Federal (EPA) emissions standards.
Items in stock: 131
Engine/Motor - SIERRA DENALI 2500 6.0L CNG (VIN B, 8th digit, opt LC8)
Select FitmentThis fitment option is for 2018 GMC Sierra Denali opt LC8) with 6.0L Naturally Aspirated Gasoline engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is B. Built to meet Federal (EPA) emissions standards.
Items in stock: 1
Engine/Motor - SIERRA DENALI 2500 6.0L gasoline (VIN G, 8th digit, opt L96)
Select FitmentThis fitment option is for 2018 GMC Sierra Denali opt L96) with 6.0L Naturally Aspirated Gasoline engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is G. Built to meet Federal (EPA) emissions standards.
Items in stock: 66
Engine/Motor - SIERRA DENALI 2500 6.0L (VIN G, 8th digit, opt L96)
Select FitmentThis fitment option is for 2018 GMC Sierra Denali opt L96) with 6.0L Naturally Aspirated Gasoline engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is G. Built to meet Federal (EPA) emissions standards.
Items in stock: 66
Engine/Motor - SIERRA DENALI 2500 6.6L (VIN Y, 8th digit, opt L5P)
Select FitmentThis fitment option is for 2018 GMC Sierra Denali opt L5P) with 6.6L Naturally Aspirated Gasoline engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is Y. Built to meet Federal (EPA) emissions standards.
Items in stock: 22
Engine/Motor - SIERRA DENALI 3500 6.0L CNG (VIN B, 8th digit, opt LC8)
Select FitmentThis fitment option is for 2018 GMC Sierra Denali opt LC8) with 6.0L Naturally Aspirated Gasoline engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is B. Built to meet Federal (EPA) emissions standards.
Items in stock: 1
Engine/Motor - SIERRA DENALI 3500 6.0L gasoline (VIN G, 8th digit, opt L96)
Select FitmentThis fitment option is for 2018 GMC Sierra Denali opt L96) with 6.0L Naturally Aspirated Gasoline engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is G. Built to meet Federal (EPA) emissions standards.
Items in stock: 66
Engine/Motor - SIERRA DENALI 3500 6.6L (VIN Y, 8th digit, opt L5P)
Select FitmentThis fitment option is for 2018 GMC Sierra Denali opt L5P) with 6.6L Naturally Aspirated Gasoline engine. Designed for vehicles with automatic transmission. Matches vehicles with the 8th digit in the VIN is Y. Built to meet Federal (EPA) emissions standards.
Items in stock: 22

Interchange Fitment FAQs

Q: How does interchange fitment work for my 2018 GMC Sierra Denali Engine/Motor?

A: All Engine/Motor options shown on this page are matched to your selected configuration: 2018 GMC Sierra Denali. Used OEM parts are dismantled from donor vehicles as complete assemblies, and a specific interchange fitment is assigned during this process. Every detail shown in the fitment notes must match your vehicle exactly.

Q: What is an interchange fitment option for my 2018 GMC Sierra Denali?

A: An interchange fitment option defines the exact donor vehicle configuration your part came from. For 2018 GMC Sierra Denali, this may include engine size, VIN code, transmission model, drivetrain, axle ratio, and other critical identifiers. This data comes from VIN decoding, OEM information, and physical inspection of the donor vehicle.

Q: Why must every fitment detail match for my 2018 GMC Sierra Denali?

A: Used OEM parts are not universal. If any fitment detail for your 2018 GMC Sierra Denali differs from what is shown in the fitment notes, the Engine/Motor may not install, communicate with your vehicle, or function correctly. Always verify all fitment details before ordering.

Q: Where does the fitment information for my 2018 GMC Sierra Denali come from?

A: Fitment information is captured when the donor vehicle is dismantled. The yard decodes the VIN for 2018 GMC Sierra Denali, checks OEM data and interchange databases, and verifies details during physical inspection. The resulting fitment is then assigned to the Engine/Motor assembly.

Q: What if there are multiple fitment options for my 2018 GMC Sierra Denali?

A: Many 2018 GMC Sierra Denali vehicles were built with multiple configurations in the same year and trim. Trim name alone (XLT, Limited, Sport, etc.) is not enough. You must match the exact configuration shown in the fitment notes—such as engine size, transmission type, drivetrain, and axle ratio—before selecting a Engine/Motor.

Q: Where can I find my 2018 GMC Sierra Denali VIN??

A: You can find the VIN for your 2018 GMC Sierra Denali on the driver-side dashboard (visible through the windshield), inside the driver-side door jamb, and on your registration or insurance documents. The VIN helps confirm the correct configuration and fitment.

Q: How do I verify the correct engine fitment for my 2018 GMC Sierra Denali?

A: For engine fitment, verify engine size (e.g., 2.7L, 3.5L, 5.0L), VIN engine code, fuel type, and whether the engine is turbocharged or naturally aspirated. These details must match the fitment notes for your 2018 GMC Sierra Denali exactly before you select an engine.

Q: Where can I find my engine VIN code or engine ID on my 2018 GMC Sierra Denali?

A: Engine identifiers can often be confirmed through VIN decoding, emissions labels under the hood, under-hood information stickers, and dealer service records for your 2018 GMC Sierra Denali. Use this information to match the engine fitment exactly.

Attention!

There are 9 Engine Assembly choices for the 2018 GMC Sierra Denali!!!
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Engine Assembly (389)

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