NHTSA ID Number: 10163227
Manufacturer Communication Number: 18NA150
Summary
This informational bulletin provides information on 6.6L Duramax Possible Oil Leak Path Information.
13 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CHEVROLET | SILVERADO | 2017 |
| CHEVROLET | SILVERADO 1500 | 2019 |
| CHEVROLET | SILVERADO 2500 | 2018-2020 |
| CHEVROLET | SILVERADO 3500 | 2020 |
| GMC | SIERRA | 2017 |
| GMC | SIERRA 1500 | 2019 |
| GMC | SIERRA 2500 | 2018-2020 |
| GMC | SIERRA 3500 | 2020 |
| GMC | SIERRA DENALI | 2018 |
Service Bulletin Bulletin No.: 18-NA-150
Date: June, 2019
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 All
Silverado
2500/3500 2019 2020
GMC
Sierra 2017 2018
Sierra
2500/3500 2019 2020
Involved Region or Country North America, Middle East, Israel, South America and Thailand.
Additional Options (RPOs) Equipped with 6.6L Diesel Engine (RPO L5P)
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.
Page 2 June, 2019 Bulletin No.: 18-NA-150
Please use the illustrations below as a guide of where
to look for a potential oil leak.
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 June, 2019 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 June, 2019 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)
5053879
Legend
(1) RTV (Front Cover Seal)
(2) SEAL, CR/SHF FRT OIL (Front
Bearing Seal)
Bulletin No.: 18-NA-150 June, 2019 Page 5
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)
Version 3
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.
Bulletin No.: 18-NA-150
Date: June, 2019
https://www.nhtsa.gov/recalls?nhtsaId=10163227
https://static.nhtsa.gov/odi/tsbs/2019/MC-10163227-9999.pdf
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