NHC MOTORS / Case studies / Mulsanne Speed · 2025
BENTLEY MULSANNE SPEED · 2025
Bentley Mulsanne Speed · 2025 Brake and Air Conditioning Care
In May 2025, we changed the engine oil and front and rear brake pads on the same Mulsanne Speed and resurfaced the discs. We checked the refrigerant and compressor-oil specifications for the air conditioning work. During the on-site check afterwards, the previous compressor noise was no longer audible.
This visit at a glance
| Vehicle | 2018 Bentley Mulsanne Speed |
|---|---|
| Work covered | Engine oil / Pads and discs / A/C, filters and tyre repair |
In this case study
- The same Mulsanne, with brakes and air conditioning in focus
- The vehicle’s oil-level display and service routine
- New pads, with the discs assessed for resurfacing
- Compressor-oil specification matters alongside refrigerant quantity
- Genuine air filters, a cabin filter and tyre repair
- New pads, reused discs and the air conditioning noise check
01
The same Mulsanne, with brakes and air conditioning in focus
This 2018 Mulsanne Speed returned to the workshop. It is the high-performance version of Bentley’s flagship saloon, with a 6.75-litre twin-turbo V8.
During this visit, the engine oil and front and rear brake pads were replaced. A compressor noise heard when the air conditioning ran was also addressed during this visit.
02
The vehicle’s oil-level display and service routine
Shell Helix Ultra ECT C3 5W-30 and BG MOA were used, and the oil filter was replaced.
We checked the vehicle’s oil-level display before the oil change. After replacing the oil and filter, we carried out the service routine with a diagnostic tool.
03
New pads, with the discs assessed for resurfacing
OEM brake pads were fitted front and rear. The remaining disc thickness was assessed as suitable for resurfacing and reuse, and the discs were machined on Hunter equipment.
We cleaned the hub faces where the discs sit and applied anti-squeal treatment to the backs of the new pads before fitting them.
04
Compressor-oil specification matters alongside refrigerant quantity
The vehicle label specifies R-1234yf refrigerant, a charge of 840g ±20g, and PAG oil. The refrigerant was analysed and recovered, followed by flushing.
We checked the compressor-oil specification in the vehicle manual before replacing the oil. We used BG Frigi-Quiet for R-1234yf.
When the technician switched on the air conditioning for the on-site check after the work, the previous compressor noise was no longer audible.
05
Genuine air filters, a cabin filter and tyre repair
Two genuine engine air filters were prepared and fitted. The cabin filter was also replaced.
The tyre contained material from an existing puncture repair. This was removed and the repair was redone using a TECH product.
06
New pads, reused discs and the air conditioning noise check
The 2025 work covered engine oil and filter, front and rear brake pads with disc resurfacing, air conditioning, filters and tyre repair.
The discs had enough thickness for resurfacing and reuse; the front and rear pads were replaced. During the on-site air conditioning check after the work, the previous compressor noise was no longer audible.
Actual work on this car in 2025
Bentley maintenance · brakes and air conditioningPublished 21 May 2025 · Watch the 11:14 video ↗Mulsanne care: common questions
Why were the discs resurfaced instead of replaced?
The remaining thickness was assessed as suitable for resurfacing and reuse. OEM pads were fitted front and rear, and the discs were machined on Hunter equipment.
What refrigerant does this Mulsanne use?
This car’s label specifies R-1234yf, a charge of 840g ±20g, and PAG oil. For a different model year or vehicle, its own label and manual must be checked.
What was observed after the air conditioning work?
When the technician switched on the air conditioning for the on-site check after the work, the previous compressor noise was no longer audible.
NHC MOTORS · SUWON
Plan the next service around what your car needs
We assess oils, filters, brakes and chassis condition alongside the service history. From a Bentley to an everyday car, we select the products and work required, with care during replacement, tightening and checks. We will explain the proposed work and estimate after consultation.
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