NHTSA Service Bulletin 10176218: 2016-2018 Infiniti Q50
Official manufacturer communication context for 2016-2018 Infiniti Q50, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.
Reviewed June 2026 from NHTSA manufacturer communication and service bulletin records. Carchieve is independent and not affiliated with any vehicle manufacturer or government agency.
Q50 AND Q60 WITH V6 ENGINE; COOLANT RESIDUE AT WATER PUMP IF YOU CONFIRM Coolant residue is on the surface of the water pump and on the water pump pulley AND Coolant DOES NOT leak out when connected to a cooling system pressure tester. HINT: The customer may state there is a coolant smell. ACTION Install an EPT sealer to the face of the water pump pulley. For EPT sealer installation, see SERVICE PROCEDURE on the next page. For EPT sealer information, see PARTS INFORMATION on the last page of this bulletin.
What this bulletin may mean before buying
Treat this as service research, not a verdict on one car. Before you buy, compare this communication with official recall campaigns, model-level owner complaint patterns, and the exact vehicle’s VIN-decoded specifications. A bulletin can help you ask a seller or dealer sharper questions about software updates, known repairs, warranty extensions and service history.
Affected products listed in this communication
Buyer checklist
- Run the 17-character VIN and confirm the year, make, model, engine and equipment match the listing.
- Check recall campaign pages for safety actions that may require dealer repair.
- Compare this bulletin with common problem pages for the same model and component area.
- Ask the seller or dealer whether the bulletin procedure, update or inspection has already been completed.
- Use the used-car buying checklist and get an independent inspection.
Frequently asked questions
What is NHTSA service bulletin 10176218?
Q50 AND Q60 WITH V6 ENGINE; COOLANT RESIDUE AT WATER PUMP IF YOU CONFIRM Coolant residue is on the surface of the water pump and on the water pump pulley AND Coolant DOES NOT leak out when connected to a cooling system pressure tester. HINT: The customer may state there is a coolant smell. ACTION Install an EPT sealer to the face of the water pump pulley. For EPT sealer installation, see SERVICE PROCEDURE on the.
Is a service bulletin the same as a recall?
No. A recall is a safety campaign with a required remedy for affected VINs. A service bulletin or manufacturer communication usually describes diagnostic, repair, software, warranty or service information.
How should a used-car buyer use this bulletin?
Use it as a research signal. Compare it with recalls, owner complaints, service records, a VIN report and an independent inspection before buying.
Check the exact VIN before you buy
Model-level pages show public safety patterns. A full VIN report helps confirm the exact vehicle, decoded specs, recall applicability and buyer checks.
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