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Capt Bob
 
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930 4 speed - synthetic to swepco

Is there any issue changing the gear oil in a 930 four speed gearbox from synthetic back to Swepco 201 manual transmission lube 80W-90?

Are there pros and cons when comparing synthetic to 80-90? My 1982 930 has 88,000 miles on it.
Old 11-27-2017, 04:52 AM
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I don't think the syncros work as well with syn, its "too slippery".

do you have LSD?\
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Old 11-27-2017, 07:57 AM
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Capt Bob
 
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Yes, LSD.

I'm going to drain all the synthetic out of the gear box and let it drip out for a while then top off with the Swepco 201.

Just not sure if there is any issue with mixing the residual synthetic that remains on the gears with the fresh Swepco when topped off.
Old 11-27-2017, 08:28 AM
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Synthetic too slippery from what I've heard as well. Personally, I wouldn't worry about a very low level of mixing the two together after a good thorough drain of the synthetic. If you're still concerned, add the Swepco - run it for a short spell - then shell out the $$bucks$$ and drain/ replace.
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Old 11-27-2017, 07:52 PM
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Dont worry about it.
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Old 11-27-2017, 08:20 PM
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Capt Bob
 
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Ok - synthetic out Swepco in...running well. Thanks!
Old 12-01-2017, 09:18 AM
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What is the pelican-brain-trust recommended change interval for 930 tranny?
Old 12-02-2017, 05:51 AM
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This stuff is really good too.
Kendall 80W-90 Gear Oil With Limited-Slip LSD Additive

Pelican Parts - European Automotive Parts and Accessories - Porsche • BMW • Mercedes • Volkswagen • Audi • Saab • Volvo • MINI
Old 12-02-2017, 12:23 PM
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Quote:
Originally Posted by zakthor View Post
What is the pelican-brain-trust recommended change interval for 930 tranny?
I go 15k mi or every 3 years, whichever comes first.
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Old 12-02-2017, 12:52 PM
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If it helps you.

the gear oil recommended by Porsche Classic is this: Fuchs Titan Supergear HXP 75W-90, SYN gear oil GL5

Greeting Dominik
Old 12-02-2017, 08:33 PM
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I suggest that you read a lot more about Swepco. BA used to recc it and it seemed to help various Porsche transaxles shift smoother... Only it turned out that it is too slick and people tend to shift too fast and ...yes.. wear out their sycros a lot faster. I ran it for a while in a 930 but swapped it out as more information came out. it's a good product but not so compatable with Porsche sycros. From G50 on it may be great.
Old 12-11-2017, 02:04 PM
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Royal Purple

Had a buddy tell me that he switched to Royal Purple and had a much easier time 2nd to 3rd and vice versa.
Anyone else hear this?
Would be handy, as my synchros are tired.
Old 12-12-2017, 12:00 PM
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When the synchros get worn, they struggle to make enough friction to change the speed of the shift sleeve during engagement. Moving over to a more slippery oil like Royal Purple will likely make the shifting worse, not better.
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Old 12-12-2017, 02:41 PM
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Capt Bob
 
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The swepco seems to have helped my situation shifting into 3rd gear...got to go nice and slow and its nice and smooth.
Old 12-14-2017, 04:49 AM
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I ran the Motul supercalifragilisticexpialidocious full synth spendy gear lube in my 930 box and it was great...noticeably better than before.
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Old 12-14-2017, 07:01 AM
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Quote:
Originally Posted by JFairman View Post
This stuff is really good too.
Kendall 80W-90 Gear Oil With Limited-Slip LSD Additive

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This stuff made a world of difference for me
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Old 12-14-2017, 09:52 AM
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Quote:
Originally Posted by Bully View Post
Had a buddy tell me that he switched to Royal Purple and had a much easier time 2nd to 3rd and vice versa.
Anyone else hear this?
Would be handy, as my synchros are tired.
Royal purple is a known failure fluid in the BMW world, I wouldn't let it anywhere near my car.
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Old 12-16-2017, 07:05 AM
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Swepco, swear by it


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Old 12-17-2017, 12:59 PM
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