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Transmission oil??

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Old 04-12-2020, 03:55 PM
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Dryfly57
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Default Transmission oil??
What would recommend w/Limited Slip.
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Old 04-12-2020, 07:42 PM
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GJSPIN
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Default Gear Oil
In my 993 C4S gearbox went with their Rx and used Redline

75W90NS GL-5 GEAR OIL.

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Old 04-12-2020, 08:30 PM
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TheFatArmadillo
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I just ordered PTX from Suncoast this morning. Seemed to be the recommendation for street use from the couple of threads I read through.
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Old 04-13-2020, 05:54 AM
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Just did a transmission oil change last week and was deciding between:
  • Redline 75W90NS gear oil
  • Driven Racing - GO 75W90 LS gear oil
  • Motul Gear 300 LS 75W90

==> decided to go with Motul Gear 300 LS 75W90.
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Old 04-13-2020, 10:09 AM
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Quadcammer
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I've used redline ns and Mobil Delvac, no real discernable difference between the two. For a normally driven street car, I'd go PTX
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Old 04-13-2020, 01:27 PM
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PTX
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Old 04-13-2020, 02:17 PM
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Dryfly57
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Thanks all for your suggestions. Much appreciated!

Just ordered PTX from Suncoast.
Last edited by Dryfly57; 04-21-2020 at 04:01 PM.
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Old 04-23-2020, 06:07 AM
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piddeb
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How often do you guys change your transmission oil? According to the book it's every 80.000km (50.000mi) but since many of the 993s may not be driven that much today it might be many years between every 80.000km...
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Old 04-23-2020, 02:58 PM
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Originally Posted by P-daddy
PTX
Originally Posted by GJSPINELLA
In my 993 C4S gearbox went with their Rx and used Redline

75W90NS GL-5 GEAR OIL.

Originally Posted by TheFatArmadillo
I just ordered PTX from Suncoast this morning. Seemed to be the recommendation for street use from the couple of threads I read through.
Originally Posted by rgupta250
Just did a transmission oil change last week and was deciding between:
  • Redline 75W90NS gear oil
  • Driven Racing - GO 75W90 LS gear oil
  • Motul Gear 300 LS 75W90

==> decided to go with Motul Gear 300 LS 75W90.
Originally Posted by Quadcammer
I've used redline ns and Mobil Delvac, no real discernable difference between the two. For a normally driven street car, I'd go PTX
Originally Posted by piddeb
How often do you guys change your transmission oil? According to the book it's every 80.000km (50.000mi) but since many of the 993s may not be driven that much today it might be many years between every 80.000km...
Good question. Last time my transmission gear oil was changed was 4 years ago. And 25k miles later. I thought it was time since I was under the car and did my yearly oil change for the coming season.

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Old 04-23-2020, 05:03 PM
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levtron
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I just had trans rebuilt and installed a Guards TBD. Mostly AX with some street use. Whats the recommendation for Trans Oil. Will need to change in 800 miles, but with CV lockdown... that may take a year ;-)....
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Old 04-24-2020, 12:54 PM
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nsully
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Copans continues to recommend Delvac 75/90. I can't think of a more reliable source.
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