NHTSA ID Number: 10198879
Manufacturer Communication Number: 21NA108
Summary
This service bulletin provides diagnostic information for the technician regarding a customer concern of engine overheating, cooling system contaminated with engine oil.
Condition
Engine is overheating.
One or more of the following conditions:
Cause
This condition may be caused by a leakage from the main oil gallery to a water jacket through block porosity or thin wall casting.
– A very thick oil in coolant mix in the radiator and coolant overflow reservoir may be found.
– The average oil pressure is over 414 kPa (60 psi) and the coolant pressure is 110 kPa (16 psi).
Correction
If a vehicle with this concern has been verified:
- If equipped, test the oil cooler system for possible leaking into the coolant through the radiator. If the oil cooler tests good, or the vehicle is not equipped with an oil cooler, then reference this bulletin and replace the engine as well as all rubber coolant hoses.
- If possible, flush the radiator and heater core. Only replace those as needed.
- If equipped, flush the rear heater core and replace hoses. Only replace those as needed.
162 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
BUICK | ENCLAVE | 2010-2021 |
| BUICK | LACROSSE | 2010-2019 |
| CADILLAC | ATS | 2013-2019 |
| CADILLAC | CT5 | 2020-2021 |
| CADILLAC | CT6 | 2016-2020 |
| CADILLAC | CTS | 2010-2015, 2017-2019 |
| CADILLAC | CTS-V | 2014 |
| CADILLAC | SRX | 2010-2015 |
| CADILLAC | XT5 | 2017-2021 |
| CADILLAC | XT6 | 2020-2021 |
| CADILLAC | XTS | 2013-2019 |
| CHEVROLET | BLAZER | 2019-2021 |
| CHEVROLET | CAMARO | 2010-2021 |
| CHEVROLET | CAPRICE | 2011-2017 |
| CHEVROLET | CAPTIVA | 2012-2018 |
| CHEVROLET | CAPTIVA SPORT | 2011-2012 |
| CHEVROLET | COLORADO | 2015-2021 |
| CHEVROLET | CORVETTE | 2021 |
| CHEVROLET | EQUINOX | 2010-2019 |
| CHEVROLET | EXPRESS | 2017 |
| CHEVROLET | IMPALA | 2012-2018, 2020 |
| CHEVROLET | TRAVERSE | 2010-2021 |
| GMC | ACADIA | 2010-2021 |
| GMC | CANYON | 2015-2021 |
| GMC | TERRAIN | 2010-2016 |
1 Associated Document
Manufacturer Communications
Bulletin No.: 21-NA-108
Date: May, 2021
NHTSA ID Number: 10178302
Manufacturer Communication Number: PIP5257E
Summary
This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have oil mixed in with the engine coolant. Technician will need to inspect the oil cooler if equipped for possible leaking into the cooling system through the radiator. If no issue found replace the engine as well as all rubber coolant hoses. Also updated to include ALL HFV6 engines Gen1 and Gen2.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5257E
Published date: 06/1/2020
NHTSA ID Number: 10163658
Manufacturer Communication Number: PIP5257C
Summary
This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have oil mixed in with the engine coolant. Technician will need to inspect the oil cooler if equipped for possible leaking into the cooling system through the radiator. If no issue found replace the engine as well as all rubber coolant hoses.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5257C
Published date: 07/9/2019
NHTSA ID Number: 10143762
Manufacturer Communication Number: PIP5257B
Summary
This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have oil mixed in with the engine coolant. Technician will need to inspect the oil cooler if equipped for possible leaking into the cooling system through the radiator. If no issue found replace the engine as well as all rubber coolant hoses.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5257B
Published date: 07/12/2018
https://www.nhtsa.gov/recalls?nhtsaId=10143762
NHTSA ID Number: 10115003
Manufacturer Communication Number: PIP5257A
Summary
This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have oil mixed in with the engine coolant. Technician will need to inspect the oil cooler if equipped for possible leaking into the cooling system through the radiator. If no issue found replace the engine as well as all rubber coolant hoses.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5257A
Date: Dec-2015
NHTSA ID Number: 10114355
Manufacturer Communication Number: PIP5257
Summary
This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have oil mixed in with the engine coolant. Technician will need to inspect the oil cooler if equipped for possible leaking into the cooling system through the radiator. If no issue found replace the engine as well as all rubber coolant hoses.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5257
Date: Jan-2015
https://www.nhtsa.gov/recalls?nhtsaId=10114355
NHTSA ID Number: 10095197
Manufacturer Communication Number: PIP5257
Summary
THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ON THE STEPS TO DIAGNOSE AND REPAIR VEHICLES THAT MAY HAVE OIL MIXED IN WITH THE ENGINE COOLANT. TECHNICIAN WILL NEED TO INSPECT THE OIL COOLER IF EQUIPPED FOR POSSIBLE LEAKING INTO THE COOLING SYSTEM THROUGH THE RADIATOR. IF NO ISSUE FOUND REPLACE THE ENGINE AS WELL AS ALL RUBBER COOLANT HOSES.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIP5257
Date: Jan-2015
- Unsurpassed freeze protection and anti-boil performance outperforms industry standards
- Organic acid technology resists rust, scale & corrosion while protecting all cooling system metals (including aluminum)
- High-quality additives protect against leaks and won’t harm gaskets, hoses, plastics or original vehicle finish
- Pre-mixed orange formula is ready-to-use in a 50/50 ratio with deionized water to protect all modern engine components from winter freezing (-34F) and summer boiling (265F).
- 5 year/150,000 mile guarantee protects against engine failure caused by freeze-ups or boil-overs
- Unsurpassed freeze protection and anti-boil performance outperforms industry standards
- Organic acid technology resists rust, scale & corrosion while protecting all cooling system metals (including aluminum)
- High-quality additives protect against leaks and won’t harm gaskets, hoses, plastics or original vehicle finish
- Orange concentrate formula should be mixed with clean tap water or demineralized water at 50/50 ratio for temperatures -34 to 265F; 60/40 for -62 to 270F; and 70/30 for -84 to 267F
- 5 year/150,000 mile guarantee protects against engine failure caused by freeze-ups or boil-overs
- VERSATILE ENGINE COOLANT: This antifreeze + coolant is designed for use in all GM vehicles 1995 and newer requiring an orange organic acid technology (OAT) coolant. This item contains a bittering agent called Denatonium Benzoate.
- PROTECTS ENGINE: This antifreeze + coolant provides protection against rust and corrosion for all cooling system metals, including aluminum
- LONG-LASTING COOLANT: This antifreeze + coolant has a service life of up to 10 years/150,000 miles with a complete cooling system flush and fill
- BETTER FORMULA: Our antifreeze coolant solution is free of amines, phosphate, borate, nitrite and silicate
- EXCELLENT PERFORMANCE: This meets the performance requirements of ASTM D3306, D4985 and GMW3420, GM6277M
- High-performance, universal automotive antifreeze/coolant with extended life
- Provides effective, long-term corrosion protection for aluminum, brass, cast iron, steel, solder, and copper
- Superior high temperature for aluminum protection, resulting in longer component life
- Silicate-free formula maintains good as new heat transfer, and reduces silicate gel formation in use or in storage
- Suitable for a 5-year or 150,000 mile service life in automotive applications; up to of 600,000 miles or 12,000 hours in heavy duty applications
- ACDelco 10-101 DEX COOL (ORANGE)
- Contains A Bittering Agent
- OEM
Last update on 2026-06-15 / Affiliate links / Images from Amazon Product Advertising API
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Service Bulletin Bulletin No.: 21-NA-108
Date: May, 2021
INFORMATION
Subject: Information on Engine Overheating, Cooling System Contaminated with Engine Oil
This bulletin replaces PIP5257E. Please discard PIP5257E.
Brand: Model:
Model Year: VIN: Engine:
(3.0L
or 3.6L)
Transmission:
from to from to
Buick
Allure
2010
2016
— —
LF1, LFW,
LFX, LLT
—
Enclave 2021 LFY, LLT
LaCrosse 2019 LF1, LFW,
LFX, LGX
Cadillac
ATS 2013 2019 LF4,
LFX, LGX
CT5 2020 2021 LGY
CT6 2016 2021 LGW, LGX
CTS 2010 2019 LFW, LF3,
LFX, LGX
SRX 2010 2016 LFX, LFW
XT5 2017 2021 LGX
XT6 2020 2021 LGX
XTS 2013 2019 LF3, LFX
Chevrolet
Blazer 2019 2021 LGX
Camaro 2010 2021 LFX, LGX
Caprice 2012 2017 LFX
Captiva 2011 2018 LFW, LFX
Colorado 2015 2021 LFX, LGZ
Equinox 2010 2017 LF1,
LFW, LFX
Impala 2012 2020 LFX
Traverse 2010 2021 LFY, LLT
GMC
Acadia 2010 2021 LGX, LLT
Canyon 2015 2021 LFX, LGZ
Terrain 2010 2016 LF1,
LFW, LFX
Page 2 May, 2021 Bulletin No.: 21-NA-108
Involved Region or Country
North America, Europe, Russia, Middle East, Iraq, Brazil, Chile, Colombia, Ecuador, Paraguay, Uruguay, Venezuela, Japan, GM Korea Company, Cadillac Korea (South Korea), China, Taiwan, Singapore, Australia/New Zealand, Other Africa
Condition
Some customers may comment that the engine is overheating.
Some customers may also comment on one or more of the following conditions:
• Oil in the coolant overflow reservoir
• Coolant discharging from the coolant reservoir Cause
This condition may be caused by a leakage from the main oil gallery to a water jacket through block porosity or thin wall casting.
– A very thick oil in coolant mix in the radiator and coolant overflow reservoir may be found.
– The average oil pressure is over 414 kPa (60 psi) and the coolant pressure is 110 kPa (16 psi).
Correction
If a vehicle with this concern has been verified:
• if equipped, test the oil cooler system for possible leaking into the coolant through the radiator. If the oil cooler tests good, or the vehicle is not equipped with an oil cooler, then reference this bulletin and replace the engine as well as all rubber coolant hoses.
• If possible, flush the radiator and heater core. Only replace those as needed.
• if equipped, flush the rear heater core and replace hoses. Only replace those as needed.
Service Procedure
Note: 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.
Refer to Engine Replace in SI.
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
Description Labor Time
4067490 Engine Replacement
Use
Published
Labor
Operation
Time
Version 1
Modified Released May 04, 2021
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