IsItAGoodCar

Common Problems with the
2017–2020 Bentley Mulsanne

We've identified 2 known issues that can affect the 2017–2020 Bentley Mulsanne. 1 of these are serious faults that could be expensive to repair.

2
Known Issues
1
Serious
1
Moderate
0
Minor

The 2017–2020 period has 1 more issue than the Bentley Mulsanne average across all year periods.

All Known Issues

6.75L V8 Turbo Oil Feed Line Leaks

SeriousEngine

The legendary 6.75-litre V8 uses turbo oil feed lines that can develop leaks as they age, leading to oil consumption, potential turbo damage, and in severe cases engine bay fires if oil contacts hot exhaust components.

Most affected: 6.75 V8

Estimated cost: £1,500–£4,000Affects: 2010–2020Often appears around: 40k–70k miles

Typical symptoms

  • •Oil smell after driving
  • •Visible oil residue around turbo area
  • •Oil pressure warnings
  • •Smoke from engine bay

What to inspect before you buy

  • ✓Inspect turbo oil feed and return lines for seepage
  • ✓Check for oil residue in the engine bay
  • ✓Ask for history of turbo-related work

Coolant Expansion Tank Leaks

ModerateCooling System

The plastic expansion tanks can crack or the seals can fail, leading to slow coolant loss.

Most affected: All variants

Estimated cost: £400–£800Affects: 2010–2020Often appears around: 40k–60k miles

Typical symptoms

  • •Low coolant warning
  • •Sweet smell of antifreeze
  • •White residue on the tank

What to inspect before you buy

  • ✓Visually inspect the expansion tank for hairline cracks or pink/orange residue

Buying Tips for the 2017 Bentley Mulsanne

  • ✓Listen for any "whining" from the power steering pump.
  • ✓Check for signs of coolant leaks around the front of the engine.
  • ✓Ensure the rear picnic tables and entertainment screens operate perfectly.
  • ✓Verify that all original accessories (umbrellas, vanity kits) are present.
2014–2016 Bentley Mulsanne

Browse 2017–2020 Bentley Mulsanne in our Directory

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Other Bentley Mulsanne Year Periods

2010–20132014–20162017–2020

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