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911uk

Rear Shock Absorber replacement Advice

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5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHRear Shock Absorber replacement Advice

Leading reported evidence

Replace original rear dampers

Performed · outcome unconfirmed

No successful repair reported for this finding.

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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed

I just replaced the original rear dampers on my C4S (at the weekend) with B6s.

Original post Read captured discussion
Rear Shock Absorber replacement Advice
Frequently discussed work

Recommend b6

No successful repair reported for this finding.

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Unsuccessful attempts
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Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

But when you go into Bilstein website, they say that B4 is only for cars with M30 set up, and instead recommend B6.

Original post Read captured discussion
Rear Shock Absorber replacement Advice
Read full discussion summary

Leading evidence: 'Replace original rear dampers' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Recommend b6' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

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1 matching discussions · 5 captured posts examined · 0 partial discussions

Compare 3 other evidence results

Recommend b6

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

But when you go into Bilstein website, they say that B4 is only for cars with M30 set up, and instead recommend B6.

Original post Read captured discussion
Rear Shock Absorber replacement Advice

Replace lot

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

Consider replacing the lot.

Original post Read captured discussion
Rear Shock Absorber replacement Advice

Replace pair at the rear

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

I want to replace the pair at the rear.

Original post Read captured discussion
Rear Shock Absorber replacement Advice
Frequently discussed actions (4)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Recommend b6

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

But when you go into Bilstein website, they say that B4 is only for cars with M30 set up, and instead recommend B6.

Original post Read captured discussion
Rear Shock Absorber replacement Advice

Replace lot

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

Consider replacing the lot.

Original post Read captured discussion
Rear Shock Absorber replacement Advice

Replace original rear dampers

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed

I just replaced the original rear dampers on my C4S (at the weekend) with B6s.

Original post Read captured discussion
Rear Shock Absorber replacement Advice

Replace pair at the rear

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster

I want to replace the pair at the rear.

Original post Read captured discussion
Rear Shock Absorber replacement Advice
Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • 911uk: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T135432Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

when my 1999 C2 went through its MOT, I was advised that there is "light misting" of oil in the nearside rear shock. I want to replace the pair at the rear. As far as I know, my car does not have the M30 suspension set up (incidentally how do i check this for certain?) looking at https://www.design911.co.uk/fu/pt38.../996-C2-3-4L-1997-08-01/Shock-Absorbers-Rear/ the suggestion is to go for B4 shocks. But when you go into Bilstein website, they say that B4 is only for cars with M30 set up, and instead recommend B6. I am confused. Can someone shed some light please? Thanks in advance.

POST 2Original post

B4 is the standard damper equivalent. B6 is the firmer option. I just replaced the original rear dampers on my C4S (at the weekend) with B6s. There is no physical size difference, so the factory part number difference is related to the different damping rates. For your C2 - B4 will be similar to original and B6 will be firmer.

POST 3Original post

Try carnewal for great bilstein prices. Consider replacing the lot. Koni are also highly regarded.

POST 4Original post

On my C4 the new bilstein B4s were 20mm shoter than the originals

This is a source reference. Confirm exact model applicability in the original material.