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Discussion summary
YOUR RESEARCH996 GT3 Cup Diff Transmission Oil - Page 1 - 911/Carrera GT - PistonHeads UK
Leading reported evidence
Install too so am interested in the responses
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Performed · outcome unconfirmed
I believe my 996.2 GT3 has a cup diff fitted too so am interested in the responses!
996 GT3 Cup Diff Transmission Oil - Page 1 - 911/Carrera GT - PistonHeads UK
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Leading evidence: 'Install too so am interested in the responses' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install too so am interested in the responses' (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.
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
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed
Changed to MOTUL - smooth as butter, cheap enough that it gets changed every two years regardless of the mileage...
996 GT3 Cup Diff Transmission Oil - Page 1 - 911/Carrera GT - PistonHeads UK
Run through translation
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
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Unsuccessful attempts
1
Discussions
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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
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Performed · outcome unconfirmed · Original poster
I've got a €7k invoice from Manthey for the gearbox rebuild but it only states Motorsport oil when ran through translation!
996 GT3 Cup Diff Transmission Oil - Page 1 - 911/Carrera GT - PistonHeads UK
Use sikolene/fuchs
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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
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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 use sikolene/fuchs which is very good in some cars and the 993gt2r which has the same diff,motul which is the best,speak to opie oils for these.
996 GT3 Cup Diff Transmission Oil - Page 1 - 911/Carrera GT - PistonHeads UK
Replace fluids i'd do the transmission as well
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Discussions
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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 contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion · Original poster
I've been told to run 75W-90 in mine, it's really only done a few hundred miles since it's last full service in 2022 so I figured while I'm changing fluids I'd do the transmission as well.
996 GT3 Cup Diff Transmission Oil - Page 1 - 911/Carrera GT - PistonHeads UK
Replace fluids i'd do the transmission as well
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Discussions that contain suggestions
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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've been told to run 75W-90 in mine, it's really only done a few hundred miles since it's last full service in 2022 so I figured while I'm changing fluids I'd do the transmission as well.
996 GT3 Cup Diff Transmission Oil - Page 1 - 911/Carrera GT - PistonHeads UK
Run 75w-90 in mine
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've been told to run 75W-90 in mine, it's really only done a few hundred miles since it's last full service in 2022 so I figured while I'm changing fluids I'd do the transmission as well.
996 GT3 Cup Diff Transmission Oil - Page 1 - 911/Carrera GT - PistonHeads UK
Use cup or plated diff, especially if
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 can get Millers in the above flavour but I read in some internet posts that we shouldn't be using LS additive transmission oils with cars using a Cup or plated diff, especially if using on track.
996 GT3 Cup Diff Transmission Oil - Page 1 - 911/Carrera GT - PistonHeads UK
Use ls additive transmission oils
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 can get Millers in the above flavour but I read in some internet posts that we shouldn't be using LS additive transmission oils with cars using a Cup or plated diff, especially if using on track.
996 GT3 Cup Diff Transmission Oil - Page 1 - 911/Carrera GT - PistonHeads UK
Use on track
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 can get Millers in the above flavour but I read in some internet posts that we shouldn't be using LS additive transmission oils with cars using a Cup or plated diff, especially if using on track.
996 GT3 Cup Diff Transmission Oil - Page 1 - 911/Carrera GT - PistonHeads UK
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.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 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: 20261027T011819Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Any recommendations?
I've been told to run 75W-90 in mine, it's really only done a few hundred miles since it's last full service in 2022 so I figured while I'm changing fluids I'd do the transmission as well.
I can get Millers in the above flavour but I read in some internet posts that we shouldn't be using LS additive transmission oils with cars using a Cup or plated diff, especially if using on track.
I've got a €7k invoice from Manthey for the gearbox rebuild but it only states Motorsport oil when ran through translation!
I think the standard answer is Mobil PTX 75w-90, which is exactly what PARR told me this morning they’ll have put in it at the last service.
Problem is it looks like most places only have that in workshops in big drums, not in 5L tins that we’d need.
PRO 5T said:
I think the standard answer is Mobil PTX 75w-90, which is exactly what PARR told me this morning they’ll have put in it at the last service.
Problem is it looks like most places only have that in workshops in big drums, not in 5L tins that we’d need.
Correct. I'd suggest speaking to Mike at Sports and Classic, I may be wrong, but I seem to recall he was prepared to decant it into smaller quantities.
Speak to millers,they will advise.
I use sikolene/fuchs which is very good in some cars and the 993gt2r which has the same diff,motul which is the best,speak to opie oils for these.
The oil will last along time now that motorsport plates have progressed over the years,the oil used to go black as in 993 lsd diffs years ago.
I'm also looking at this and from research on
Rennlist
, and
here
, it looks like PTX if you have standard GT3 LSD, SHC (Delvac in USA) if you have cup/motorsport built LSD. I've just bought the
SHC from Opie
as this looks to be what is currently in mine (cup diff).
s_mcneil said:
I'm also looking at this and from research on
Rennlist
, and
here
, it looks like PTX if you have standard GT3 LSD, SHC (Delvac in USA) if you have cup/motorsport built LSD. I've just bought the
SHC from Opie
as this looks to be what is currently in mine (cup diff).
Good info! How many litres are we expected to use? on a gearbox drain and re-fill?
MOTUL 75W90 LS - had Mobil before - too much chatter from the cup plates. Changed to MOTUL - smooth as butter, cheap enough that it gets changed every two years regardless of the mileage...
PRO 5T said:
Good info! How many litres are we expected to use? on a gearbox drain and re-fill?
According to the 997 Workshop manuals between 2.5 and 3.3 litres, my old service invoice has 3.5L listed, I bought 4L.
997.1
997.2
This is a source reference. Confirm exact model applicability in the original material.
