NHTSA service bulletin

NHTSA Service Bulletin 10170092: 2011-2016 Bentley Mulsanne

Official manufacturer communication context for 2011-2016 Bentley Mulsanne, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 10170092 summary graphic for 2011-2016 Bentley Mulsanne
10170092NHTSA document ID
Manufacturer communicationcommunication type
1affected product rows
82/100quality score

Reviewed June 2026 from NHTSA manufacturer communication and service bulletin records. Carchieve is independent and not affiliated with any vehicle manufacturer or government agency.

Quick answer

Mulsanne Steering Gear - Hydraulic Oil leak Customer statement / workshop findings Increased steering effort, power steering pump noise or a hydraulic fluid leak from the underside of the vehicle. Hydraulic fluid leak from the Steering Rack Pinion Bearing. Technical background The Steering Rack may leak low pressure hydraulic fluid from the Pinion Bearing due to degradation of the Pinion Bearing oil seal. An improved material specification for the Pinion Bearing oil seal has been introduced. Measure Vehicles with less than 10.000 miles / 16.000 kilometres or under one year old Replace the Steering Rack Assembly Refer to Rep. Gr.48. Steering Rack To Remove and Fit. Vehicles with a repeat failure - Replace the Steering Rack Assembly Refer to Rep. Gr.48. Steering Rack To Remove and Fit. Vehicles with a first time failure, over 10.000 miles or 16.000 kilometres - replace the Pinion Bearing oil seal. Refer to Pinion Bearing Oil Seal Replacement Below.

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

MakeModelModel yearsBuyer note
BentleyMulsanne2011-2016Ask for service records and run the exact VIN before purchase.

Buyer checklist

  1. Run the 17-character VIN and confirm the year, make, model, engine and equipment match the listing.
  2. Check recall campaign pages for safety actions that may require dealer repair.
  3. Compare this bulletin with common problem pages for the same model and component area.
  4. Ask the seller or dealer whether the bulletin procedure, update or inspection has already been completed.
  5. Use the used-car buying checklist and get an independent inspection.

Frequently asked questions

What is NHTSA service bulletin 10170092?

Mulsanne Steering Gear - Hydraulic Oil leak Customer statement / workshop findings Increased steering effort, power steering pump noise or a hydraulic fluid leak from the underside of the vehicle. Hydraulic fluid leak from the Steering Rack Pinion Bearing. Technical background The Steering Rack may leak low pressure hydraulic fluid from the Pinion Bearing due to degradation of the Pinion Bearing oil seal. An.

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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