Champagne-silver modified Audi A6 C6 Avant on silver split-spoke wheels outside an autumn stone estate barn

Audi A6 C6 / 4F.
The coilover guide.

Shop the coilovers

A C6 should still feel settled with a boot full of luggage. Start with the right saloon or Avant application, identify its original suspension and choose a height that works on your roads.

Which A6 C6 / 4F do you have?8 listed kits · 3 brandsReviewed 9 November 2026

The A6 with the single-frame face.

The C6’s long flanks and tall grille carry a good set of wheels well. Keep enough tyre and suspension movement for the way the car is used, especially when an Avant carries passengers and luggage.

Saloon, Avant, axle loads and original equipment all affect the order. The current range includes separate SPAX body applications, two Eibach Avant load limits and BC references that need their exact wording checked.

The C6 saloon arrived in 2004 with Audi’s tall single-frame grille and a more prominent shoulder running along the body. The Avant followed for 2005, with a long estate roof, a sloping tailgate and the same broad front end.

Inside, the MMI controls sit around the wide centre console. The Avant has a load area designed around luggage restraints and a low floor.

The chassis combines a four-link front axle with an independent trapezoidal-link rear axle. On the steel-spring rear suspension, the coil sits on its own seat beside the damper. This is the hardware the replacement parts must suit.

The Avant was also offered with adaptive air suspension and electronically controlled damping. Record what is on the car now, including its suspension codes, previous repairs and conversions. A trim badge or photograph will not identify every part needed.

Start with your A6 C6 / 4F.

Match the model year, engine and body style before comparing brands.

Graphite modified Audi A6 C6 saloon on silver upgraded wheels in a brick residential mews

Saloon applications

SPAX RSX754 and RSX3-1508 name the type-4F A6 saloon, including quattro but excluding Avant and S6. Their listed application starts in April 2004. Keep the exact body, engine, original equipment and permitted axle loads with the comparison.

See the saloon references
Champagne-silver modified Audi A6 C6 Avant with upgraded wheels beside an autumn stone barn

Avant applications

BC S-50 names the 2006–12 C6 Avant FWD/AWD. SPAX RSX755 and RSX3-1510 name the type-4F Avant, including quattro and excluding S6, from March 2005. The Eibach references have their own load and equipment limits. Confirm the complete row for your estate.

See the Avant references
Blue Audi A6 C6 Avant on silver multi-spoke wheels beside a riverside quay

Eibach: check both axle loads

The two current Pro-Street S Avant references have different front limits: 1240 kg for -03-22 and 1305 kg for -04-22, with 1300 kg rear limits. Both specify no levelling control. Match the car’s permitted loads, component markings and current certificate; the same price does not make the references interchangeable.

Compare the Eibach references
Black modified Audi A6 C6 Avant on upgraded silver wheels outside an independent workshop

Air suspension and levelling

An air-sprung Avant has a different starting point, including controlled damping. Describe the original system before asking about replacement parts. Do not treat a steel-spring application or a general electronic-warning note as approval for a complete air conversion.

Discuss the original suspension
Burgundy Audi A6 C6 saloon with silver wheel upgrades in a tree-lined courtyard

S6, RS6 and A6L checks

The S-10 product listing says S6/A6L, while the current BC manufacturer row names A6 Sedan C6. That difference needs an exact application check. The SPAX rows expressly exclude S6. Provide the model, body, market and original suspension before relying on any of these references.

Check the exact model
Graphite modified Audi A6 C6 Avant outside circuit garages on graphite multi-spoke wheels

Changed cars and circuit projects

Include wheel width, offset, tyres, spacers and any suspension conversion. A developed circuit car also needs its weight, mounting parts and available movement considered. Agree the specification around the actual build before placing the order.

Discuss my C6 setup

What do you want
from the car?

Road miles, circuit weekends or a car built around the lap. Start with how you drive.

Selected configurationSee optionsinc. VAT · Matching 2006–12 C6 Avant / BC Racing BR-RN S-50

Keep the estate useful and give the wheels room to move.

Read the buying advice

BC Racing BR-RN S-50 is the current 2006–12 C6 Avant FWD/AWD reference. Its published configuration records no front top mount, a rubber rear mount and nominal 10 kg/mm springs at both ends. Confirm the original equipment, supplied rear seats and which mounting parts must be retained or renewed before choosing the height.

  • Confirm the exact Avant application
  • Plan the front mounting parts
  • Check clearance with the normal load
View current configurations
Selected configurationSee optionsinc. VAT · Matching non-S6 type-4F Avant / SPAX RSX3-1510

Choose separate damping controls when you have a setup plan for them.

Read the buying advice

SPAX RSX3-1510 names the type-4F Avant, including quattro and excluding S6. It provides separate bump and rebound adjustment, with 35–65 mm front and rear figures in the listed application. Confirm the exact row and original-height baseline, then agree the tyres, spring requirements and intended events with the team preparing the car. Follow the kit’s instructions and keep a record of the settings.

  • Match the body, engine and date row
  • Agree tyres and the intended events
  • Record each damping change
View current configurations

Specify the suspension around the weight and hardware of the build.

Read the buying advice

Bring the car’s measured weight, tyre specification, mounting parts and available suspension movement. Include brake, wheel and aero changes. An S6, RS6, A6L or previously air-sprung car needs its own confirmed application and replacement plan. Agree the spring and damper requirements with the team responsible for the car’s setup and inspection.

  • Describe the complete build
  • Confirm mounts and usable movement
  • Plan measured setup and inspection
Discuss a C6 circuit build

The rear spring sits beside the damper.

Separate rear spring and damperThe coil spring rests between its own seats, beside a separate shock absorber. This fixed component diagram does not show vehicle dimensions, mounting hardware or suspension movement.SpringDamper

On a standard Audi A6 C6 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 C6 has an independent trapezoidal-link rear axle. The coil sits on a separate seat on the lower arm, beside the damper. Use the exact kit’s parts list and fitting instructions to establish its supplied rear arrangement.

Check the rear seats, adjusters, dampers and mounts against the exact kit. Original air suspension needs its own equipment plan. Ask how height is set at each end and follow that reference’s instructions; do not assume that a threaded body on one corner describes every corner.

Understand height and spring preload
Champagne-silver modified Audi A6 C6 Avant on upgraded wheels standing normally on a level workshop floor

An estate’s setup has to work loaded.

Have the fitter inspect the front links and joints, rear arms and bushes, spring seats and mounting parts. Confirm which parts are supplied and which original components must be retained or replaced. Record previous repairs and conversions alongside the original suspension codes.

Set the usable height around the wheels, tyres and normal load. Check clearance through steering and suspension movement, then complete the alignment and any affected equipment checks. Confirm the inspection and follow-up work before booking the fitting slot.

Identify the original suspension

Record the suspension codes and the actual parts fitted. Audi’s early saloon and Avant material describes different sport and heavy-duty height baselines. Confirm the specific car and the kit’s measurement basis before interpreting a lowering figure.

Treat wheels and clearance as one decision

Record wheel width, offset, tyre size and spacer thickness. Check the inner gap to suspension parts and the tyre’s path under the arch through steering and suspension movement. Include the passenger and luggage load the estate normally carries.

Resolve levelling and damping equipment

Tell the fitter about air springs, levelling and controlled damping, including anything removed during an earlier conversion. Agree the mechanical parts, electrical work and effect on original functions before ordering. A warning-cancellation provision is not proof that an entire system is covered.

Finish the setup at the chosen height

Have the joints, bushes, spring seats and mounting parts checked before fitting. Follow the kit’s setting and settling instructions, then measure clearance and alignment. Keep the fitted-part and setting records for later wheel or load changes.

The current A6 C6 / 4F range.

Compare the controls and hardware included in each range.

BC Racing

S-50 names the C6 Avant FWD/AWD. The current S-10 manufacturer row names A6 Sedan, while the product title says S6/A6L; keep that discrepancy as an exact check. Both published RN configurations record no front top mount, rubber rear mounting and nominal 10/10 kg/mm springs. Confirm the required original mounts and supplied rear components for the exact application.

View BC Racing A6 C6 / 4F kits

SPAX

RSX754 and RSX3-1508 are the saloon pair; RSX755 and RSX3-1510 are the Avant pair. Their current rows include quattro and exclude S6, with 35–65 mm front and rear figures. RSX3 adds separate bump and rebound controls. Keep the exact body, dates and baseline with the comparison.

View SPAX A6 C6 / 4F kits

Eibach

The two listed Pro-Street S references are for Avant type4F5. Their front load limits differ, although the rear limit and listed price are the same. Both require no levelling control, with certificate, component-marking and possible additional OE-part or wheel-spacer checks. Confirm the original damping equipment and the current documents before ordering.

View Eibach A6 C6 / 4F kits

Find your A6 C6 / 4F coilovers.

Prices include UK VAT. Choose an application and brand, then open a kit for its current options and availability.

8 listings

Match the engine, body style and axle-load limits on the product page before ordering.

6 of 8 shown
All A6 C6 / 4F kit links and part numbers

Before you order.

  1. Identify your car

    Identify the C6 body, engine, build date and driven wheels. Include the exact S6, RS6 or long-wheelbase model details where relevant.

  2. Match the kit

    Match the complete reference, body row and permitted axle loads. Resolve conflicting application wording before placing the order.

  3. Check what’s included

    Confirm the supplied spring seats and mounting parts. Tell the fitter about levelling, controlled damping and previous conversions.

  4. Check your modifications

    Record wheels, tyres and spacers. Check steering and suspension clearance with the usual passenger and luggage load.

  5. Plan fitting

    Confirm supply timing before booking fitting. Agree the height, measured alignment, equipment checks and follow-up inspection.

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 C6 / 4F coilovers.

Check the details before choosing your kit.

Which A6 generation does this guide cover?

This is the C6/type-4F family: the saloon introduced in 2004 and the Avant for 2005. Earlier C5 and later C7 applications are separate. Match the exact body, build date, engine and original equipment against the current kit row.

Are the C6 rear spring and damper separate?

On the steel-spring rear suspension, yes. The independent trapezoidal-link axle carries the coil on its own lower-arm seat beside the damper. Check the rear seats, adjusters and mounting parts supplied for the exact kit. An air-sprung car needs a separate replacement plan.

Does BC S-10 establish fitment for every S6 or A6L?

No. The product title says S6/A6L, but the current BC manufacturer row names A6 Sedan C6 FWD/AWD. Have the exact model, body, market, build date and original suspension confirmed before relying on that reference.

Does the listed BC RN configuration include new front top mounts?

The current S-10 and S-50 configurations record no front top mount and rubber rear mounting, with nominal 10 kg/mm front and rear springs. Confirm the exact supplied parts and which original mounting components must be retained or renewed.

How do the SPAX saloon and Avant kits differ?

RSX754 and RSX3-1508 name the saloon; RSX755 and RSX3-1510 name the Avant. Their retained rows include quattro and exclude S6. The RSX3 versions provide separate bump and rebound controls; the other two record single-adjustable damping. Check the exact dates and original-height baseline.

Why are two Eibach Pro-Street S Avant references listed?

The -03-22 reference has a 1240 kg front axle-load limit; -04-22 has a 1305 kg front limit. Both have 1300 kg rear limits and specify no levelling control. Match the car’s permitted loads, component markings and current certificate conditions; price alone does not identify the correct reference.

Can I order a steel-spring kit for an air-sprung Avant?

Do not assume it covers the conversion. The factory adaptive air system also has controlled damping. Confirm the exact replacement hardware, electrical work and effect on levelling and height functions with the fitter before ordering.

How should I choose the road ride height?

Choose a usable setting within the exact kit’s instructions after checking the wheels, tyres, suspension movement and normal load. Confirm the original suspension baseline, finish the measured alignment and complete the affected equipment checks with the fitter.

Let’s talk suspension.

Find your C6, then include its body, engine, driven wheels and permitted axle loads. Add the original suspension equipment, any conversions and the wheel and tyre details for an exact application check.

Call Coilovers Direct0115 647 9207
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