Audi A6 C8 / 4A.
The coilover guide.
Shop the coiloversChoose the C8 kit around its front housing, driven wheels and original suspension. The listed Avant references separate 48.5 mm from 53 mm housings, then add body, axle-load and equipment conditions.
The C8 long-roof A6
An Avant can look low on the right wheels and still carry the people and luggage it was bought for. Set that brief first: the roads, the usual load and the space the tyres need when the suspension moves.
Start the parts comparison with the front housing diameter. The BC references separate 48.5 mm and 53 mm front-wheel-drive cars; Eibach’s listed 53 mm applications distinguish front-wheel drive from quattro. Give the workshop those details before choosing a finished height.
Audi introduced the C8 A6 in 2018 and announced the Avant on 11 April. Its low, wide grille, defined wheel-arch shoulders and tapering roof gave the estate a sharper outline. A slim trim strip connects the rear lamps beneath the broad tailgate.
Inside, two touchscreens took over much of the earlier car’s button-operated control layout. Mild-hybrid engines formed part of the launch range. Those features identify the generation, but a suspension order still needs the exact body, engine and original chassis equipment.
The front and rear axles both use five links. At the rear, this replaced the C7’s trapezoidal-link arrangement. Audi developed separate front-wheel-drive and quattro axle versions, with steel springs and conventional or controlled dampers, plus an optional air-suspension system.
Audi offered exterior S line styling as an option. On a modified car, body trim and wheel design give little help with identifying the actual front housing and damper equipment.
Start with your A6 C8 / 4A.
Match the model year, engine and body style before comparing brands.
FWD Avant: 48.5 mm housing
BC S-52 names the C8 A6 Avant FWD, 2018 onward, with a 48.5 mm front strut. Have the workshop verify the actual housing against the application and parts list. This reference does not establish a 53 mm or quattro fitment.
See the 48.5 mm reference
FWD Avant: 53 mm housing
BC S-53 is the 53 mm FWD Avant reference. Eibach -028-02-22 also specifies a 53 mm clamping area, with named FWD engines and maximum axle loads of 1175 kg front and 1280 kg rear. Match the full application and original equipment.
Compare the 53 mm FWD kits
Quattro Avant applications
Eibach -028-05-22 lists named C8 Avant quattro engines, a 53 mm clamping area and maximum loads of 1310 kg front and 1430 kg rear. Its A6 lowering ranges differ from the same part’s A7 row. The BC S-52 and S-53 rows here specify FWD.
See the quattro reference
Controlled dampers, air and levelling
The Eibach application notes exclude electronic suspension systems and levelling control. Identify the actual suspension codes, dampers and springs before ordering. A general cancellation-device note does not override an application-specific exclusion or approve an air conversion.
Check my original suspension
Saloon and other C8 versions
The current A6 references shown here name the Avant. For a saloon, allroad, S6, RS6, plug-in hybrid or a different A6 generation, supply the exact model and chassis details for a separate application check. A shared platform or later registration year cannot settle the order.
Check my exact A6 version
Changed cars and circuit projects
Include previous suspension conversions, wheels, tyres, brake changes and the car’s measured weight. For circuit use, add the events and expected running conditions. Agree the required suspension specification and mounting parts around that build.
Discuss my C8 projectWhat do you want
from the car?
Road miles, circuit weekends or a car built around the lap. Start with how you drive.
Keep the height usable with the load the car normally carries.
Read the buying advice
BC Racing BR-RS S-52 is the current C8 Avant FWD reference for the 48.5 mm front housing. Its listed RS configuration uses rubber top mounts and nominal 10 kg/mm front and 10 kg/mm rear springs. Confirm the original equipment, supplied mounting parts and rear seats with the exact application before fitting. A 53 mm car needs its own reference.
- Verify the 48.5 mm FWD application
- Confirm the mounting parts
- Keep clearance with normal load
Choose the specification around the tyres and intended events.
Read the buying advice
Describe the road mileage, tyre type, brake changes and circuit days you have planned. Include the front housing size and original suspension. Ask the people preparing the car to agree the spring, damping and mounting requirements, then plan its inspection and setup work. A higher catalogue price alone does not establish track suitability.
- Bring the tyre and event plans
- Check movement and clearances
- Agree measured setup and follow-up
Specify the suspension with the completed car in mind.
Read the buying advice
Supply the measured weight, tyres, brakes and mounting changes, including details of any previous air or electronic-damper replacement. Agree the required hardware, working movement and inspection work before ordering. Keep the exact body and driven wheels in the specification. Agree who will inspect and set up the car before the first event.
- Measure the completed car
- Agree springs, dampers and mounts
- Plan inspection and setup work
The C8’s separate rear spring.
On a standard Audi A6 C8 steel-spring rear suspension, the rear spring and damper are mounted separately.
Component layout only. Mounts, dimensions and adjusters vary by kit.The steel-spring C8 has a five-link independent rear axle. The coil sits in its own seat beside the damper on both the front-wheel-drive and quattro layouts shown by Audi. This is a different rear axle design from the C7’s trapezoidal-link arrangement.
Confirm the spring seats, height adjusters and mounting parts supplied by the exact replacement kit. The component diagram identifies the separate spring and damper; it does not establish that the FWD and quattro kits interchange. Factory air suspension needs its own checked replacement plan.
Understand height and spring preload
Start with the hardware already fitted.
Give the workshop the full part number, body, driven wheels, front housing size and permitted axle loads. Ask it to identify the current suspension and confirm which mounts, spring seats and other original parts the chosen kit needs.
Agree supply timing before booking the job. Set aside time for inspection, fitting, measured alignment and equipment checks, with the finished height based on the actual wheels, tyres and load.
Identify the front housing
Have the workshop check the actual front housing and clamping-area specification against the full kit reference. The listed 48.5 mm and 53 mm choices are suspension dimensions, not wheel sizes or trim levels.
Allow for the loaded car
Record wheel width, offset, tyre size and spacers. Check arch and suspension clearance through steering and suspension movement with the passengers and luggage the car usually carries. Choose the height after those checks.
Resolve the original equipment
Distinguish passive steel springs, controlled dampers, air and levelling. Record any earlier conversions and optional rear-wheel steering. Follow the exact application exclusions and the fitter’s current instructions for the equipment affected.
Complete the fitting and setup
Inspect links, bushes, mounts and spring seats before fitting. Agree the usable height, then check alignment and clearance. Have the fitter identify any affected lighting, driver-assistance or suspension-system checks and the required follow-up work.
The current A6 C8 / 4A range.
Compare the controls and hardware included in each range.
S-52 and S-53 separate the C8 Avant FWD by 48.5 mm and 53 mm front struts. Both current RS configurations record rubber top mounts and nominal 10/10 kg/mm springs. Confirm the exact body, original equipment and supplied mounting parts; those FWD rows do not establish quattro or saloon coverage.
View BC Racing A6 C8 / 4A kits
Pro-Street S -028-02-22 is the listed 53 mm FWD application; -028-05-22 names quattro engines with different axle-load limits. Keep the A6 Avant lowering ranges with their own row. Both exclude electronic suspension systems and levelling control. Check the full engine, component markings, current certificate and availability before ordering.
View Eibach A6 C8 / 4A kitsFind your A6 C8 / 4A coilovers.
Prices include UK VAT. Choose an application and brand, then open a kit for its current options and availability.
4 listings
Match the engine, body style and axle-load limits on the product page before ordering.
![BC Racing Coilovers - Audi A6 Avant (Strut 48.5mm) (FWD) (2018+) [C8]](/images/09cf8cd191b679-480.webp)
BC Racing · BCR-S-52
BC Racing Coilovers - Audi A6 Avant (Strut 48.5mm) (FWD) (2018+) [C8]
FWD Avant: 48.5 mm housing
Eibach · PSS65-15-028-02-22
Eibach Pro-Street S Coilover Kit for Audi applications - PSS65-15-028-02-22
FWD Avant: 53 mm housing
BC Racing · BCR-S-53
BC Racing Coilovers - Audi A6 Avant (Strut 53mm) (FWD) (2018+) [C8]
FWD Avant: 53 mm housing
Eibach · PSS65-15-028-05-22
Eibach Pro-Street S Coilover Kit for Audi applications - PSS65-15-028-05-22
Quattro Avant applications
All A6 C8 / 4A kit links and part numbers
- BC Racing · BCR-S-52: BC Racing Coilovers - Audi A6 Avant (Strut 48.5mm) (FWD) (2018+) [C8]
- BC Racing · BCR-S-53: BC Racing Coilovers - Audi A6 Avant (Strut 53mm) (FWD) (2018+) [C8]
- Eibach · PSS65-15-028-02-22: Eibach Pro-Street S Coilover Kit for Audi applications - PSS65-15-028-02-22
- Eibach · PSS65-15-028-05-22: Eibach Pro-Street S Coilover Kit for Audi applications - PSS65-15-028-05-22
Before you order.
Identify your car
Identify the C8 body, engine, build date and driven wheels. Check the full model and chassis details.
Match the kit
Verify the front housing size, exact reference and permitted axle loads. Keep the FWD and quattro applications distinct.
Check what’s included
Confirm supplied mounts, spring seats and adjusters. Resolve original controlled damping, air, levelling and previous conversions.
Check your modifications
Record wheels, tyres and spacers. Check steering and suspension clearance with the car’s normal load.
Plan fitting
Confirm current supply timing before booking fitting. Agree the height, alignment, equipment checks and follow-up.
See what the adjustments do.
Choosing coilovers for road and track
Compare the kit against your roads, tyres and setup plans before counting adjusters.
Ride height and spring preload
Understand the two adjustments before choosing a lowering range.
What spring rate tells you
Compare force and movement, read the units and choose a spring with the damper in mind.
Spring rates and top mounts
Read the front/rear figures and check which mounts come with your kit.
Questions about Audi A6 C8 / 4A coilovers.
Check the details before choosing your kit.
Which A6 C8 versions do the listed kits cover?
The current A6 applications here name the C8/type-4A5 Avant. Check the exact engine, driven wheels, front housing, loads and equipment within each reference. A saloon, allroad, S6, RS6, plug-in hybrid, A6 e-tron or later generation needs its own application confirmation.
What do the 48.5 mm and 53 mm figures mean?
They distinguish the front strut or housing specification used by these references. Eibach calls its 53 mm dimension the housing diameter in the clamping area. Have the workshop identify the actual parts against the manufacturer’s application and fitting documents; wheel size and an S line badge do not establish that dimension.
How do BC S-52 and S-53 differ?
S-52 names the C8 Avant FWD with a 48.5 mm front strut; S-53 names the 53 mm FWD version. Both current RS listings record rubber top mounts and nominal 10 kg/mm front and 10 kg/mm rear springs. The matching rate and price do not make the two housing specifications interchangeable.
Which current reference names the C8 Avant quattro?
Eibach PSS65-15-028-05-22 lists named quattro engines, a 53 mm clamping-area diameter and maximum axle loads of 1310 kg front and 1430 kg rear. Match the full engine and equipment conditions. BC S-52 and S-53 and Eibach -028-02-22 here are FWD applications.
Why can the same Eibach part show different lowering figures?
The vehicle row matters. For the C8 A6 Avant, -028-02-22 lists 40–65 mm front and rear. The quattro -028-05-22 lists 25–50 mm front and 20–40 mm rear. Their A7 Sportback rows show 30–50 mm at both ends. Keep the figures with the exact body, original suspension and application conditions.
Can a cancellation module override the Eibach electronic-suspension exclusion?
No. These application rows exclude electronic suspension systems and levelling control. A general note about warning cancellation does not override that restriction or approve an air conversion. Identify the original equipment and have the exact replacement plan confirmed before ordering.
Are the steel C8 rear spring and damper separate?
Yes. Audi’s original five-link rear axle drawings for FWD and quattro show the coil in its own seat beside the damper. Confirm the rear seats, adjusters and mounts supplied by the exact kit. This component layout does not make FWD and quattro parts interchangeable.
Should I subtract the quoted drop from the car’s current height?
First establish the original suspension and the kit’s measurement basis. The C8 had different factory steel and air settings. Existing factory lowering reduces the additional drop where the product conditions say so. Check usable movement and wheel clearance with the normal load before settling on a setting.
Let’s talk suspension.
Find your C8, then include its body, engine, driven wheels, front housing size, axle loads and original suspension. Add wheel changes or previous conversions so the exact kit can be checked.