fullymatted.
Back to search
Porsche Club GB

Auto transmission oil and rear diff oil

Add to repair workspace
Open repair workspace
Original source
3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHAuto transmission oil and rear diff oil

Leading reported evidence

Replace tiptronic filter in the gear box

Performed · outcome unconfirmed

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 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 got mine from design911 I also changed the tiptronic filter in the gear box.

Original post Read captured discussion
Auto transmission oil and rear diff oil
Frequently discussed work

Check rubber donut

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

I thing I would check when doing the tip oil change is check the rubber donut from the front of the gear box to the front transfer box they tend to split.

Original post Read captured discussion
Auto transmission oil and rear diff oil
Read full discussion summary

Leading evidence: 'Replace tiptronic filter in the gear box' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check rubber donut' (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.

Read captured replies

1 matching discussions · 3 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Use but will look up

Performed · outcome unconfirmed

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 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 did mine this year can't remember which I used but will look up.

Original post Read captured discussion
Auto transmission oil and rear diff oil

Check rubber donut

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

I thing I would check when doing the tip oil change is check the rubber donut from the front of the gear box to the front transfer box they tend to split.

Original post Read captured discussion
Auto transmission oil and rear diff oil

Check when doing the tip oil

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

I thing I would check when doing the tip oil change is check the rubber donut from the front of the gear box to the front transfer box they tend to split.

Original post Read captured discussion
Auto transmission oil and rear diff oil

Fill quantity is 1.5 litres

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

Front final drive capacity/fill quantity is 1.5 litres.

Original post Read captured discussion
Auto transmission oil and rear diff oil
Frequently discussed actions (8)

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

Check rubber donut

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

I thing I would check when doing the tip oil change is check the rubber donut from the front of the gear box to the front transfer box they tend to split.

Original post Read captured discussion
Auto transmission oil and rear diff oil

Check when doing the tip oil

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

I thing I would check when doing the tip oil change is check the rubber donut from the front of the gear box to the front transfer box they tend to split.

Original post Read captured discussion
Auto transmission oil and rear diff oil

Fill quantity is 1.5 litres

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

Front final drive capacity/fill quantity is 1.5 litres.

Original post Read captured discussion
Auto transmission oil and rear diff oil

Replace quantity is 1.2 litres

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

Rear final drive capacity/change quantity is 1.2 litres.

Original post Read captured discussion
Auto transmission oil and rear diff oil

Replace quantity is 4.5 litres

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

Capacity is 9.0 litres, but the change quantity is 4.5 litres, because you can't drain the torque converter.

Original post Read captured discussion
Auto transmission oil and rear diff oil

Replace their oil

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

Has anyone changed their oil on the transmission and diff recently?

Original post Read captured discussion
Auto transmission oil and rear diff oil

Replace tiptronic filter in the gear box

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 got mine from design911 I also changed the tiptronic filter in the gear box.

Original post Read captured discussion
Auto transmission oil and rear diff oil

Use but will look up

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 did mine this year can't remember which I used but will look up.

Original post Read captured discussion
Auto transmission oil and rear diff oil
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.

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

  • Porsche Club GB: 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: 20261026T120458Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi, Has anyone changed their oil on the transmission and diff recently? Which the best/correct oil for a 2003 996 C4S? Thanks

POST 2Original post

I did mine this year can't remember which I used but will look up. I got mine from design911 I also changed the tiptronic filter in the gear box. I thing I would check when doing the tip oil change is check the rubber donut from the front of the gear box to the front transfer box they tend to split. They can be bought for about 80.00 takes about 15 mins to change.

POST 3Original post

The ATF on the C4S original fill was either Shell ATF 3403-M115 or Fuchs ATF 3353 or 3353 Plus. Capacity is 9.0 litres, but the change quantity is 4.5 litres, because you can't drain the torque converter. You need to monitor the ATF temperature when filling, and without the right equipment can be a difficult process. Original fill for the front and rear final drive was either Mobilube PTX 75W-90 or Shell Transaxle 75W-90. Rear final drive capacity/change quantity is 1.2 litres. Front final drive capacity/fill quantity is 1.5 litres.

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