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NHTSA ID Number: 10222657
Manufacturer Communication Number: 18-NA-150
Summary
This informational bulletin provides information on 6.6L Duramax Possible Oil Leak Path Information.
This document is to help identify where to look for an oil leak on the 6.6 Duramax engine.
Note: Please keep in mind that a leak on the top of the engine will trail down the back side of the engine and appear as a rear cover leak.
39 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CHEVROLET | SILVERADO 1500 | 2017-2018 |
| CHEVROLET | SILVERADO 2500 | 2019-2023 |
| CHEVROLET | SILVERADO 3500 | 2019-2023 |
| CHEVROLET | SILVERADO 4500HD | 2019-2023 |
| CHEVROLET | SILVERADO 5500HD | 2019-2023 |
| CHEVROLET | SILVERADO 6500HD | 2019-2023 |
| GMC | SIERRA 1500 | 2017-2018 |
| GMC | SIERRA 2500 | 2019-2023 |
| GMC | SIERRA 3500 | 2019-2023 |
1 Associated Document
Manufacturer Communications
Bulletin No.: 18-NA-150
Date: September, 2022
MC-10222657-0001.pdf 649.535KB
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NHTSA ID Number: 10163227
Manufacturer Communication Number: 18NA150
Summary
This informational bulletin provides information on 6.6L Duramax Possible Oil Leak Path Information.
1 Associated Document
Manufacturer Communications
Bulletin No.: 18-NA-150
Date: June, 2019
MC-10163227-9999.pdf 1246.237KB
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- Full synthetic 5W-40 diesel engine oil with Triple Protection Plus technology protects against wear, deposits, and oil breakdown
- Improved wear performance with significantly increased level of protection against harmful engine wear (compared to previous generation API CJ-4 engine oils)
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- Multi-functional dispersant additives provide an enhanced level of protection against the effects of soot, dirt, and other contaminants
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- Synthetic blend 15W-40 diesel engine oil with Triple Protection Plus technology protects against wear, deposits, and oil breakdown
- Ideal for on-highway fleets, construction, and agricultural machinery, and diesel pickup trucks — including high-power vehicles that require resistance to heat and stress
- Triple Protection Plus technology offers better low-temperature flow, which delivers excellent equipment protection, long engine life, and maintains viscosity control under high temperatures
- Delivers good engine cleanliness and protection against piston deposits, ensuring engine and component reliability at extended oil drain intervals
- Advanced low-ash formulation helps control the blocking or poisoning of exhaust after-treatment devices, helping maintain vehicle emission compliance and engine fuel efficiency
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- ADVANCED FUEL ECONOMY up to 1.5% over 15W-40 conventional oils in on-highway operations
- UNIQUE 5,000 MILES OIL DRAINS EXTENSION in Cummins X15/X12 engines when average is 7mpg or higher
- Excellent wear protection during severe operating conditions
- Oil durability: strong oxidation and viscosity control with less oil consumption
- Better contamination control with superior soot-busting, deposit-dispersing capability
- Strong stay-in-grade performance throughout the life of the oil
- Friction modified with micron moly and penetrate
- A premium synthetic blend, long drain mixed-fleet engine oil specifically formulated for on- highway applications, including 2017 greenhouse gas (GHG 17) compliant diesel engines
- Isozyme Advanced Technology: The Next Generation of Heavy Duty Engine Oil Chemistry - engineered to deliver longer oil life, better wear protection and longer engine life
- Isoclinal: Certified clean - ensure your lubricants meet OEM cleanliness requirements to help you minimize downtime, reduce maintenance costs and extend equipment life
- Provides high performance piston deposit control and turbocharger protection due to its superb oxidation performance. Its high performing detergent and dispersant additives provide excellent diesel engine component protection.
- Exceptional soot dispersancy and wear control - Cylinders, pistons, rings, and valve train components are well protected against wear and corrosion, providing optimum service life and minimal maintenance, contributing to maximum equipment utilization and minimal downtime.
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- 15W-40 diesel engine oil with Triple Protection technology protects against wear, deposits, and oil breakdown
- Provides significantly better wear protection than previous generation oils to maximize engine efficiency and prolong engine life
- Formulated with advanced additive technology plus synthetic base oil for enhanced deposit control and superior engine cleanliness throughout the oil drain interval
- Enhanced shear stability for better viscosity control and optimal engine oil pressure
- Outstanding protection for heavy-duty diesel engines, including the latest emission-controlled engines using EGR and containing a diesel particulate filter
- Full synthetic 5W-40 motor oil that is made with natural gas and designed to maximize engine protection
- Formulated for modern light-duty diesel and high-performance engines in European vehicles, including Fiat, Mercedes-Benz, Porsche, Renault, and VW
- Helps extend engine life and protects for up to 15 years or 500,000 miles, whichever comes first, guaranteed*
- Delivers faster low-temperature oil flow and protection in extreme heat
- Protects horsepower and keeps engine closer to factory clean (based on Sequence VH and M-111 sludge test using SAE 0W-40)
Last update on 2025-05-08 / Affiliate links / Images from Amazon Product Advertising API
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Copyright 2022 General Motors
LLC. All Rights Reserved. Service Bulletin Bulletin No.: 18-NA-150 Date: September, 2022 INFORMATION Subject: 6.6L Duramax Possible Oil Leak Path Information Brand: Model: Model Year: VIN: Engine: Transmission: from to from to Chevrolet Silverado 2017 2018 L5P, L5D Silverado 2500/3500 2019 2023 Silverado 4500HD, 5500HD, 6500HD 2019 2023 GMC Sierra 2017 2018 Sierra 2500/3500 2019 2023 Involved Region or Country North America, Middle East, Israel, South America and Thailand. Additional Options (RPOs) Equipped with 6.6L Diesel Engine (RPO L5P or L5D) Important: Service agents must comply with all International, Federal, State, Provincial, and/or Local laws applicable to the activities it performs under this bulletin, including but not limited to handling, deploying, preparing, classifying, packaging, marking, labeling, and shipping dangerous goods. In the event of a conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you must follow those applicable laws. This document is to help identify where to look for an oil leak on the 6.6 Duramax engine. Note: Please keep in mind that a leak on the top of the engine will trail down the back side of the engine and appear as a rear cover leak. Please use the illustrations below as a guide of where to look for a potential oil leak. These Illustrations are of a L5P engine; the L5D would be similar. Page 2 September, 2022 Bulletin No.: 18-NA-150 Possible Oil Leak Paths 5053868 Legend (1) GASKET, VLV RKR ARM CVR (Rocker Cover Gasket) (2) GASKET, CYL HD (Head Gasket) (3) SENSOR, ENG OIL PRESS (Oil Pressure Sensor) (4) PLUG, ENG BLK OIL GAL (Plugs in Block Qty 4) (5) SEAL, OIL LVL IND TUBE (O-Ring on Oil Indicator Tube) (6) SEAL, ENG OIL LVL IND SW (Oil Level Sensor) (7) SEAL, OIL PAN DRN PLUG (Oil Drain Plug) 5053869 Plugs and Gaskets in Oil Cooler and Filter Bulletin No.: 18-NA-150 September, 2022 Page 3 5053871 Ghost view of the Oil Cooler Cover to reveal 2 O-rings (SEAL, ENG OIL CLR). 5053872 Legend (1) GASKET, TURBO OIL FEED PIPE (Turbo Oil Feed Pipe into Block, Turbo Pipe removed for picture only) (2) PLUG, ENG BLK OIL GAL (Section cut through Flywheel housing to show 2 plugs on the back of the engine block ) 5053874 Legend (1) GASKET, TURBO OIL RTN PIPE (Turbo Oil Drain Pipe Gaskets (Quantity 3)) Page 4 September, 2022 Bulletin No.: 18-NA-150 5053875 Legend (1) SEAL, OIL FIL CAP (Oil Separator Gaskets) (2) GASKET, TURBO OIL FEED PIPE (Turbocharger Oil Gasket (2) ) 5053878 Legend (1) PLUG, ENG BLK OIL GAL (Oil Gallery Plug) (2) RTV (Oil Pan Seals) (3) PLUG, CYL HD OIL GAL (Upper Oil Pan Plug) Bulletin No.: 18-NA-150 September, 2022 Page 5 5053879 Legend (1) RTV (Front Cover Seal) (2) SEAL, CR/SHF FRT OIL (Front Bearing Seal) 5053880 Note: (Flywheel Housing has been removed for clarity of picture) Legend (1) RTV (Flywheel Housing Seal) (2) SEAL, CR/SHF RR OIL (Rear Bearing Seal) Page 6 September, 2022 Bulletin No.: 18-NA-150 Version 6 Modified Released May 04, 2018 Revised July 25, 2018 – Added the 2019 Model Year. Revised June 24, 2019 – Added 2500/3500 to Models and 2020 to Model Year section. Revised October 19, 2020 – Added 2021 Model Years to 2500/3500 models and added 2019–2021 Silverado 4500, 5500 and 6500 HD Models and added RPO L5D. Revised January 07, 2022 – Added 2022 to Model Year. Revised September 09, 2022 – Added 2023 to Model Year. GM bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
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