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996 TT Transmission oil

Dock (Atlanta)
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Dock (Atlanta) Member

Dock (Atlanta)

Posted
Posted

I checked the DIY section but want to make sure about this - The same transmission oil can be used in both the front and main differentials on the 996 Turbo? I'm planning on using Red Line 75W-90 gear oil (GL-5 rated) for both.

Dock (Atlanta) Member

Dock (Atlanta)

Posted
  • Author
Posted
Correct, 75W-90 gear oil.

Thanks Loren.

The mechanic at the dealer said any API GL-5 rated hypoid gear oil in 75W-90 weight would be fine in the front differential. I am planning on using Red Line 75W-90 API GL-5 + Hypoid Gear Oil. I'm guessing this is a good gear oil...any comments?

ebaker Member

ebaker

Posted
Posted
Correct, 75W-90 gear oil.

Thanks Loren.

The mechanic at the dealer said any API GL-5 rated hypoid gear oil in 75W-90 weight would be fine in the front differential. I am planning on using Red Line 75W-90 API GL-5 + Hypoid Gear Oil. I'm guessing this is a good gear oil...any comments?

I think GL5 will cause problems in the rear transaxle. It's too slippery. The levels of antifriction/antiwear additives are too high. This keeps the syncros from working properly. Redline makes GL4 oils in regular and light weight I believe.

  • 2 weeks later...
SPR Member

SPR

Posted
Posted

What would be the result of using such a light gear oil other than the syncros being wierd? Would it damage anything?

Correct, 75W-90 gear oil.

Thanks Loren.

The mechanic at the dealer said any API GL-5 rated hypoid gear oil in 75W-90 weight would be fine in the front differential. I am planning on using Red Line 75W-90 API GL-5 + Hypoid Gear Oil. I'm guessing this is a good gear oil...any comments?

I think GL5 will cause problems in the rear transaxle. It's too slippery. The levels of antifriction/antiwear additives are too high. This keeps the syncros from working properly. Redline makes GL4 oils in regular and light weight I believe.

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