23 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHJust changed my gearbox oil to Motul Gear 300
Leading reported evidence
Check ) only two manual transmission fluids
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
There are (or were last time I checked) only two manual transmission fluids.
Leading evidence: 'Check ) only two manual transmission fluids' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check ) only two manual transmission fluids' (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
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 changed the manual transmission gear oil at 75K.
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.
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.
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 · Original poster
Ended up using a straight 10 mm Allan key with a jack handle as a cheater.
Check with your local porsche dealer parts department
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
Check with your local Porsche dealer parts department to learn what parts numbers/fluids possibly even additives (if any) are recommended for your car.
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
So, I read this thread, looked at the chart that shows how similar the Motul numbers are to the Shell product (recommended by Porsche, which I could not find anywhere) and decided to go with Motul - which I got 3 miles from my house at a motorcycle shop.
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
Check with your local Porsche dealer parts department to learn what parts numbers/fluids possibly even additives (if any) are recommended for your car.
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.
23 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 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: 20261027T150039Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello all
Just did some maintenance on the weekend and changed out my gearbox oil. I think I still had the OEM Porsche fluid in there, I have only 50,000 miles on the car but I felt it was time. Man are the fill and drain plugs ever tight, I broke my 10 mm Allen socket on the fill plug! Ended up using a straight 10 mm Allan key with a jack handle as a cheater.
Anyway, to those who are looking for a good replacement fluid for the OEM Porsche stuff, give it a try. Gear noise is reduced and shifting is so smooth now. I used to use Motul ester based oils in my sportbikes and had the same result.
I ended up buying from an online retailer that specializes in motorcycle parts, 3L shipped with taxes was $81, it is probably cheaper for those in the USA. It is GL4/5 approved so it meets the requirements for our boxes.
http://www.motul.com/system/product_...%29%5B1%5D.pdf
Was your shifting noticeably harder when cold, and did that change with Motul. Mine are pretty notchy when cold, had replaced it with new OEM fluid but didn't change anything.
Mine was notchy when cold too but today ambiant is in the high 70's so hard to judge. It is smoother on cold startup at these temps then it was before. When we have a cold day I will report back and give my impression.
The factory service interval is a joke. Change your gear oil every 15,000 miles or every 2nd year, whichever comes first. You'll thank me when you don't need to rebuild your gearbox until after 100k mi instead of at 60k or 70k.
Have a couple hundred miles on it now and all I can was is wow, I can't believe how much smoother it is, warm, cold doesn't matter. I have a short shifter as well so any notchyness in the box is very apparent.
Highly recommend guys!
I changed the manual transmission gear oil at 75K.
I think Porsche sugggests a change at 90K.
Anyway, I used Mobil 1 Synthetic 75W-90 LS.
If anything, it runs quieter and shifts eaiser. Can't really notice a difference.
Have over 88K now so far so good.
They have Gear 300 LS for limited slip boxes, but the viscosity specs are much different. Maybe an additive could be added to the regular stuff?
Gear 300:
http://www.motul.com/system/product_...%29%5B1%5D.pdf
Gear 300 LS:
http://www.motul.com/system/product_...pdf?1303841962
Not trying to be harsh but do you realize this is not the right gear oil? The OEM Porsche gear oil is like night and day compared to the Mobil stuff. It may be a little more but its worth the difference in how much better the trans operates, cold, warm, doesnt matter. Dont know whats in the stuff but it works better than any after market brand.
The Motul I put in was better then the OEM Porsche fluid that was in there, but again it was old with 50,000 miles on it. I referred to this chart when I decided, Motul was on the only one that had cold and hot viscosity specs that surpassed the OEM Porsche fluid (Shell), plus I could get it very easily.
I am getting ready to change the fluids in my tranny, and with 131K on the odo, this may be the way to go. You used Motul Gear 300 75W-90
How much does it use?? Is there a filter
My recollection is in the tranny fluid document there is no mention made of any special fluid for those cars equipped with LSD. I seem to recall that additives are not advised.
Now it could be Porsche has issued some tech bulletin that overrides this but I have no knowledge of this. Check with your local Porsche dealer parts department to learn what parts numbers/fluids possibly even additives (if any) are recommended for your car.
There are (or were last time I checked) only two manual transmission fluids. One from Mobil (Mobilube something or other) and Shell Transaxle fluid. They are miscible so there's no need to worry about which is in the tranny/diff.
No issues with gearbox whine at all on my car. People complaining of that must have other issues lol.
And thanks for the chart!
My car is an all year daily diver and I run it below freezing temperatures. The low temperature viscosity was really important to me as I didn't want my car to shift like a Mack truck in the winter.
On another note, if the shift cables are adjusted or set on the "tight" side to begin with, it will contract just enough in the cold to make shifts a bit difficult until warmed up.
I recently readjusted my cables and shifting has improved quite a bit in the cold now. It still feels good in hot weather as well.
If you look at the spacing of the adjustment grooves, you can see they're separated by fractions of a millimeter for a reason. Even the most minor adjustments can have a noticeable effect, especially running an SSK.
Cosmo Kramer
, thanks for the advice, I just refreshed my tranny with
Motul 300 75W90
and what a difference!!!!!!!! My car was running fine without any noticeable problems. It is time to change the motor oil and thought that I would do the tranny also. MAN!!! what a difference with the Motul..... It drivers like a new car. The tranny shifts smooth as silk and it is as quiet as a church mouse
I don't know if others will have the same results, but I am very happy
Just thought I'd share this with the group
Hi All,
I am another happy user of Motul 300 75W90. I had Delvac in my tranni for 25 miles. Even in 65 degree weather, the car shifted very poorly until warmed up - then it shifted fine. But, that will not work for me or the car. So, I tried to buy the Porsche stuff from the dealer. They told me that they use a fully synthetic Mobil 75W90 fluid that they buy in bulk. So, I read this thread, looked at the chart that shows how similar the Motul numbers are to the Shell product (recommended by Porsche, which I could not find anywhere) and decided to go with Motul - which I got 3 miles from my house at a motorcycle shop. GREAT STUFF. Car shifts awesome from start up to shut down. Very happy with it. Thanks for the advice guys.
Ray
