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YOUR RESEARCHI'm going to change the fluid in my Boxster S 6 speed - do it twice? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Replace fluid in an otherwise "sealed
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Performed · outcome unconfirmed
Add to this; every single time that I have changed fluid in an otherwise "sealed for Life" component, I have discovered that the fill level is significantly lower than the factory recommendation.
I'm going to change the fluid in my Boxster S 6 speed - do it twice? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Replace fluid in an otherwise "sealed' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean grease' (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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Performed · outcome unconfirmed · Original poster
However, before I use that, I was considering running some Mobil 1 synthetic in the gearbox for a thousand miles or so sort of as a flush.
I'm going to change the fluid in my Boxster S 6 speed - do it twice? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use standard porsche gear oil
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I'm going to change the fluid in my Boxster S 6 speed - do it twice? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Clean grease
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Suggestion
PS From a bearing manufacturer, if a bearing has completely clean grease, it would last for ever.
I'm going to change the fluid in my Boxster S 6 speed - do it twice? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Fill level is significantly lower than the factory recommendation
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Suggestion
Add to this; every single time that I have changed fluid in an otherwise "sealed for Life" component, I have discovered that the fill level is significantly lower than the factory recommendation.
I'm going to change the fluid in my Boxster S 6 speed - do it twice? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Fill level is significantly lower than the factory recommendation
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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Read evidence and context
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
Add to this; every single time that I have changed fluid in an otherwise "sealed for Life" component, I have discovered that the fill level is significantly lower than the factory recommendation.
I'm going to change the fluid in my Boxster S 6 speed - do it twice? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Fill with mobil 1
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Suggestion · Original poster
I'd drain the old junk out, fill with Mobil 1 then drain that after 1000 miles, to get all remains of the old stuff out with it, then fill with the Porsche fluid.
I'm going to change the fluid in my Boxster S 6 speed - do it twice? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Fill with the porsche fluid
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Suggestion · Original poster
I'd drain the old junk out, fill with Mobil 1 then drain that after 1000 miles, to get all remains of the old stuff out with it, then fill with the Porsche fluid.
I'm going to change the fluid in my Boxster S 6 speed - do it twice? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace fluid in an otherwise "sealed
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
Add to this; every single time that I have changed fluid in an otherwise "sealed for Life" component, I have discovered that the fill level is significantly lower than the factory recommendation.
I'm going to change the fluid in my Boxster S 6 speed - do it twice? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace i am going
No successful repair reported for this finding.
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Reported fixes
0
Unsuccessful attempts
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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 was wondering the same thing, since at my next change I am going to Millers CRX 75w90 NT, and I would like to flush out all the current oil, but that will probably be impossible.
I'm going to change the fluid in my Boxster S 6 speed - do it twice? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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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.
15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
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Generation: 20261026T150451Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My 2002 Boxster S has what I believe to be the original load of gear oil in the trans. It's got 106,000 miles on it and it doesn't shift as smooth as I think it should. I bought the expensive Porsche lubricant for it.
However, before I use that, I was considering running some Mobil 1 synthetic in the gearbox for a thousand miles or so sort of as a flush. I'd drain the old junk out, fill with Mobil 1 then drain that after 1000 miles, to get all remains of the old stuff out with it, then fill with the Porsche fluid. I know that can't hurt things but am I wasting my time and money doing that?
Not sure but Mobil 1 is an engine oil not gearbox over here in NZ. Quite a different product. Been driving manual cars for 40 years. Never ever changed the gearbox oil in any car or ever had a gearbox or diff problem.
PS From a bearing manufacturer, if a bearing has completely clean grease, it would last for ever. Wearing comes from contaminates. Gearboxes and diffs are sealed and should therefore stay clean.
Engines are quite different. Lots of dirt from the incoming air and combustion by products, hence the need to change.
The stiffness is some other issue.
When I changed the rear diff oil and the transfer case oil in my Toyota FJ Cruiser, I picked up about 1 MPG highway, which was a nice bonus and fairly significant, since I went from 16-17 MPG to 17-18 MPG.
I bet you will see an improvement.
I was wondering the same thing, since at my next change I am going to Millers CRX 75w90 NT, and I would like to flush out all the current oil, but that will probably be impossible. What I will probably do is take it for a little drive and get it nice and warmed up, and then get it home and jack it up and start draining the old oil while it is still warm. Maybe that will help more of it drain out, and that is probably as good as I'm going to be able to get it...
I filled mine with Fuchs Titan Race Synchro 75w-90 and it’s improved the shifting. When cold it’s a bit sluggish but when hot I find it much improved over whatever was in there when I bought it.
Been great on track also.
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It will be teeh best thing you do. Remember, remove the fill plug before you remove tee drain plug just in case teh fill plug is seized which has happened.
Detailed thread here on me changing mine. Might help or might not???
http://forum.porsche-club-ireland.com/index.php?topic=8069.0
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You will find, unless your trans is cooked, your new oil will be fine. No need for any funky flushes or whatever. Things that can effect shifting are the shifter itself, very worn out if original. Motor mounts, same as shifter. Possible shift cables and linkage. Porsche trannies are notchy, they always have been. They are not designed to blast through the gears. If you are experiencing balk, or second gear pop, you have other issues that fluid my help initially but will need to be addressed at some point.
Keep in mind too that you need to remove the lower pan to get to the drain plug. The crossmember bolts can a be a bugger to get lined back up. A lift is VERY helpful when messing with that sucker.
Haha, I know, right? I didn't even know where to start with that.
"Sealed for life", as it relates to drivetrain components, is self- fulfilling, Haha. NEVER, EVER trust that.
Lubricants are broken down over time by much more than simple contaminants. Shear forces are primary, as are heat and moisture.
Add to this; every single time that I have changed fluid in an otherwise "sealed for Life" component, I have discovered that the fill level is significantly lower than the factory recommendation. This must be due to fluid going somewhere. Regardless of the absence of visible leaks, weeps, or seeps.
Seriously: never trust old lubricant. Never, ever.
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Any part that has "life" or "lifetime" (as relating to useful functionality or warranty) always makes me chuckle....if the part has failed, didn't reach the end of its life? If it's labeled "sealed for life", that just means (to me at least) that it's something that I can't service...or at least not without some creativity and a big hammer..."life" does not quantify some amount of time, could be 10 years or 10 minutes; it most certainly doesn't mean forever.
This is a source reference. Confirm exact model applicability in the original material.
