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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH997.1 C2 Man - gear oil
Leading reported evidence
Use motul gear 300 75w-90
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Read evidence and context
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Performed · outcome unconfirmed
I do not have an LSD so I used Motul Gear 300 75W-90 from here:
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Suggestion
Do your own due diligence to confirm, that's what I did before changing the oil in mine - trawled the forums to find comments by people who had dome it previously in the same gearbox.
Leading evidence: 'Use motul gear 300 75w-90' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace oil in mine - trawled the forums' (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.
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Suggestion
Do your own due diligence to confirm, that's what I did before changing the oil in mine - trawled the forums to find comments by people who had dome it previously in the same gearbox.
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.
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Suggestion · Original poster
If I am not mistaken, wouldn't the gearbox use the same fluid for lsd / non lsd differentials?
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Replace oil in mine - trawled the forums
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
Do your own due diligence to confirm, that's what I did before changing the oil in mine - trawled the forums to find comments by people who had dome it previously in the same gearbox.
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.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Forum Australia: 1 discussions
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Generation: 20261026T135432Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all,
I am new the forum and would appreciate any advise on which gearbox oil (manual) I should use in my 997.1 c2 coupe? Look forward to any thoughts.
Different gearbox, but as far as I know the Aisin in the 997.1 takes the same GL4 75W-90 as the Getrag G96/01 in my 996.2. Do your own due diligence to confirm, that's what I did before changing the oil in mine - trawled the forums to find comments by people who had dome it previously in the same gearbox. There was plenty of love for the Motul 300. To note, you need to know if you have a limited slip diff and buy the oil accordingly, since it is shared with the differential and they make different oils to suit.
I do not have an LSD so I used Motul Gear 300 75W-90 from here:
https://clickableautomotive.com.au/motul-gear-300-75w90-1l.html
There is also a perfectly valid argument that says go to your dealer and buy genuine oil. There is only around 3l and it doesn't need to be changed all that often so the difference in price is fairly unimportant. Plus, they should be able to provide you the correct oil per your VIN, so no guesswork.
I am super-happy with the Motul, much smoother shifts especially from cold. But I am working on the assumption that the oil I changed out was original and as such had done a lot of work so fresh genuine oil may well have delivered a similar improvement.
HTH
Good to hear all went well, Motul products have been promoting motorsports for years and I really rate their products highly - even if they are French ....
😝
