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Old 11-20-2015, 11:48 AM   #1
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Mobil 1 synthetic gear lubricant LS

Any good for 2000 boxster s?
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Old 11-20-2015, 12:03 PM   #2
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Do yourself a favour and get the genuine Porsche gear oil - you won't regret it, especially for cold shifting. Porsche gear oil is unique and even large oil companies don't make the exact alternative lube.
Use the search function and you will see lots of people going back to the genuine stuff after experimenting with other lubricants.
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Old 11-20-2015, 12:04 PM   #3
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I chose to use factory fill transmission fluid. Lots of threads about notchy shifting with other products.
Yes, it's pricier, but worth it as often as it needs to be done.
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Old 11-20-2015, 12:10 PM   #4
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I agree with above. This is the lowest price I've found.
https://www.ecstuning.com/Porsche-1998-Boxster-986-Base-Convertible-H6_2.5L/Drivetrain/Manual_Transmission/ES1513799/
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Old 11-20-2015, 12:27 PM   #5
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Wouldn't swepco 201 be more affordable and just as good? 101 recommends.
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Old 11-20-2015, 12:42 PM   #6
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101?

Just read this: http://986forum.com/forums/437747-post24.html

Full thread: http://986forum.com/forums/general-discussions/55977-2nd-gear-hard-shift-after-tranny-oil-change.html

Regards, Markus

Last edited by Smallblock454; 11-20-2015 at 12:44 PM.
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Old 11-20-2015, 12:44 PM   #7
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Sorry 201. I don't have any issues. Car is getting near the 50k Mark. Not sure what previous owner did. Thinking preventive.
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Old 11-20-2015, 12:48 PM   #8
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In previous posts we have done deep research into this subject .
There are lots of opinions from people who seem to know little about the chemistry that makes a particular lubricant suitable for the 6 speed gearbox.
There are more significant recommendations from the few who actually rebuild these gearboxes.
A few us us researched ,shared & debated the technicalities (not opinions) a while back. The short version was to use the factory fill. Swepco 201 was an alternative but it unfortunately lacks some of the significant(?) tribological additives in the Shell factory fill. We failed to find a way of boosting the critical additives in non-Shell oil.
My opinion is that part of the 2nd gear issue is the engagement problem(detent) but that insufficient(or depleted?) friction modifiers cause the synchronizer on 2nd to be ineffective in fast gear changes.In stead of speculating ,i reluctantly chose to replace the oil at 60k or less intervals with Shell factory fill.I was hoping to come up with an improvement on the Shell but failed. It has been reported that the gbox lubricant is seldom changed at any mileage and that may explain the failures/problems.
But the pros/cons of specific lubricants are trivial if the seal has failed on the infamous bearing and the 2nd gear teeth are worn. Why? Because you'll be removing and rebuilding the gearbox eventually to replace that bearing and 2nd gear.
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Old 11-20-2015, 01:09 PM   #9
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So am I ok to wait to 60k. I don't have any shifting problems.
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Old 11-20-2015, 01:15 PM   #10
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Also if you have shifting problems when cold, check the front engine / motor mount. That solved my shifting problems completely. My only problem with 2 gear was that it was not shiftable when gearbox was cold. There are others that report that the 2 gear jumps out. That is the detend problem Gelbster is talking about.

I would recommend the gear oils Porsche recommends, because they have a very special API 4 / 5 composition and additives. In your case with a Box 2000 S Shell Spirax 75W-90 or Mobil Mobilube PTX 75W-90 are the recommended gear box oils by Porsche. I use the Shell Spirax now. Got it from a group buy.

Regards from Germany
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Old 11-20-2015, 01:34 PM   #11
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Thanks. Will do.
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Old 11-20-2015, 03:05 PM   #12
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Aren't the fluids for the 5-speed and the 6-speed different?
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Old 11-20-2015, 03:08 PM   #13
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Quote:
Originally Posted by lkchris View Post
Aren't the fluids for the 5-speed and the 6-speed different?
Yes.............
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Old 11-20-2015, 03:59 PM   #14
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Ok suggestion for 6 speed?
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Old 11-21-2015, 05:59 AM   #15
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Quote:
Originally Posted by DWBOX2000 View Post
Ok suggestion for 6 speed?
The OEM fluid.
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Old 11-21-2015, 05:24 PM   #16
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Thanks JFP. Will do, the problem now is trying to get some. I don't need 20 gallons or whatever the dealer sells it by. I'll figure something out. Thanks again. David
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Old 11-21-2015, 06:40 PM   #17
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Try Suncoast Porsche. They sell by the liter. it was $29/L +shipping a few years ago when I changed the gear oil in my 6 speed.
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Old 11-22-2015, 08:18 AM   #18
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The problem is, the 6-speed fluid is easily available in liters.

The 5-speed fluid isn't.
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Old 11-23-2015, 01:34 PM   #19
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Why is it you can't just pick up, seems like everything I buy I need to pay shipping these days. Nice to just pick up.
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Old 11-23-2015, 06:28 PM   #20
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Uh, there's shipping cost in everything ... unless it's grown or made in your back yard.

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