| “This site contains affiliate links for which OEMDTC may be compensated” |
NHTSA ID Number: 10127197
Manufacturer Communication Number: PIP4836A
Summary
This Preliminary Information communication provides information to the technician about vehicle that have an oil leak that appears to be from the flywheel housing cover sealing surface. The technician will need to check the for leaks at the turbo charger oil feed hole as well as for damage or porosity. Check the upper oil pan as well as the upper oil pan to flywheel housing and the upper to lower oil pan. Leaks from the oil cooler can cause damage to the oil cooler O-rings. The engine block oil gallery cup plugs can also be a cause of the leak. If the oil gallery cup plug is found to be leaking replace all 3 of them at the same time.
Condition/Concern
A dealer may encounter a customer concern of an engine oil leak. The oil leak may seem like it is emanating from the flywheel housing cover sealing surface.
Recommendation/Instructions
Complete the current Service Information diagnostics for oil leak diagnosis.
Check for leaks at the turbocharger oil feed and oil drain line connections at the block and flywheel housing.
Parts
| Part Number | Description | QTY |
12651561  | Plug, Engine Block Oil Galley (19mm) | 3 |
5 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CHEVROLET | EXPRESS | 2015 |
| CHEVROLET | SILVERADO 2500 | 2015 |
| GMC | SAVANA | 2015 |
| GMC | SIERRA 2500 | 2015 |
| GMC | SIERRA DENALI | 2015 |
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP4836A
Date: Sep-2015
MC-10127197-9999.pdf 345.546KB
Loading...
Reload document 
Open in new tab
| “This site contains affiliate links for which OEMDTC may be compensated” |
- 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)
- Enhanced fuel economy capability of 1.5% without compromising engine protection or durability (compared to 15W-40 oils)
- Multi-functional dispersant additives provide an enhanced level of protection against the effects of soot, dirt, and other contaminants
- Resists breakdown by heat to provide continuous protection throughout the service interval, and also provides improved low-temperature flow compared to conventional 15W-40 oils
- 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
- EXCELLENT WEAR PROTECTION IN HEAVY DUTY APPLICATIONS that can take a toll on critical internal moving parts
- RESISTS OXIDATION AND FIGHTS DEPOSITS & SLUDGE with higher quality synthetic base oils and special inhibitors
- PROTECTS DURING COLD START UPS WHILE CONTROLING SOOT as heavy-duty equipment can sit idle for extended periods of time
- 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.
- Leading Manufacturer Of High-Quality Products
- International Renown For Our Diverse Range Of Award-Winning Products
- Fully Equipped With State-Of-The-Art Technology
- All Products Have Been Designed With The Professional In Mind
- Constantly Modernizing Our Powerful Devices To Meet The Demands Of The Modern User
- 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 2025-04-19 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.
SEOCONTENT-START
Bulletin No.: PIP4836A Date: Sep-2015 Subject: Rear Of Engine Oil Leak Models: 2015 Chevrolet Express, Silverado 2015 GMC Savana, Sierra Equipped with 6.6L Duramax Diesel Engine RPO codes LGH or LML This PI was superseded to update Model Years and Recommendation/Instructions. Please discard PIP4836. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern A dealer may encounter a customer concern of an engine oil leak. The oil leak may seem like it is emanating from the flywheel housing cover sealing surface. Recommendation/Instructions Complete the current SI diagnostics for oil leak diagnosis. Check for leaks at the turbocharger oil feed and oil drain line connections at the block and flywheel housing. 1. Inspect the turbocharger oil feed hole for signs of damage or porosity. Refer to picture below 2. Inspect for imperfections in the gasket sealing surfaces (lack of flatness, debris or damage to the feed line banjo fitting itself.) 3. Check for leaks from the oil pan sealing surfaces. Leaks from the oil pan area could be from the sealing surfaces of the upper oil pan, upper oil pan to flywheel housing and/or from the lower oil pan to upper oil pan. Important: If repairs are made to the oil pan sealing surfaces be sure to clean both sides of the sealing surfaces with brake cleaner and allow to dry completely before re-assembling. 4. Check for leaks at the engine oil cooler. Leaks from the oil cooler can be caused by debris or damage to the oil cooler O-ring. 5. Check for leaks at the engine block oil gallery cup plugs. There are sub-oil galleries that run the full length of the block on both sides of the engine (same gallery that feeds oil pressure sensor). These galleries end at the rear of the block and are sealed with cup plugs (properly listed and available in GMSPO parts imager). Since these galleries run on either side of the engine, this oil leak may be found on the right or left rear of engine. The flywheel housing cover must be removed to service these plugs. If one oil gallery cup plug is found to be leaking, replace all three (two on the left and one on the right) cup plugs at the same time the flywheel housing is resealed. Refer to Service Information Document for Engine Block Cleaning and Inspection for replacement information. When replacing these oil gallery cup plugs use Loctite 272T (or Equivalent) part number 89021297 (in US) or 10953488 (in Canada) as a sealer. During cup plug replacement ensure at least 1 mm of recess when pressing in the plug. Parts Information Part Number Description QTY 12651561 Plug, Engine Block Oil Galley (19mm) 3 Warranty Information For vehicles repaired under warranty use: Labor Operation Description Labor Time 4067010 Flywheel Housing Replacement Use Published Labor Operation Time Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. Additional SI Keywords Galley
**************************************************************************************************************
SEOCONTENT-END
1 thought on “Rear Of Engine Oil Leak – 2015 Chevrolet & GMC 6.6L Duramax Diesel”