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Transmission Oil to use in Cup box?

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Old 07-19-2011, 04:59 PM
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Crazy Canuck
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Default Transmission Oil to use in Cup box?

I found a Cup gearbox that I will be putting in my '04 GT3.

What transmission oil do I use?
Old 07-19-2011, 05:23 PM
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jrgordonsenior
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Hers.....
Old 07-19-2011, 05:30 PM
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Bill911
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Manual says "Mobilube SHC"
Old 07-19-2011, 08:30 PM
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mikymu
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Originally Posted by jrgordonsenior
Hers.....
lol

Only if her lube does not contain impurity.

I use Mobil Delvac 75W-90 in my Cup and really smooth out down shift in my sequential

http://www.lufteknic.com/Merchant2/m...ode=lubricants

"Original fill in 996/997 GT3/Cup cars, and GT3Rs. Works well in all 901, 915, G50, G96 gearboxes. Used extensively in Porsche Motorsport products in every grueling test there can be LeMans, Sebring, Daytona, etc. We also use it in our service department in all street and race cars. Works in cars with or without (LSD) limited slip differentials"

Old 07-20-2011, 03:53 PM
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Crazy Canuck
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Thanks guys. Delvac it is.

Found some in Ottawa. 20L pail only. Doh. I have enough for a few changes.
Old 07-20-2011, 04:01 PM
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GTgears
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Originally Posted by Crazy Canuck
Thanks guys. Delvac it is.

Found some in Ottawa. 20L pail only. Doh. I have enough for a few changes.
If you service your box as frequently as you should that pail won't last you much longer than a single season...
Old 07-20-2011, 09:25 PM
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Originally Posted by GTgears
If you service your box as frequently as you should that pail won't last you much longer than a single season...
Yup, I change my sequential oil about every 3 events ... or every time I hear "crunch" with gear change lol
Old 07-20-2011, 09:29 PM
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Originally Posted by GTgears
If you service your box as frequently as you should that pail won't last you much longer than a single season...
That's what I figured.
Old 06-17-2016, 10:55 AM
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pete95zhn
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OK, available are either Mobilube SHC 75W-90 or Mobil Delvac Synthetic Gear Oil 75W-140. Which one from those two? Or is Mobil Delvac Synthetic Gear Oil 75W-90 better than those two? How about PTX?
Rebuilt box with CUP's LSD, otherwise more or less like 996 GT2.
Old 06-21-2016, 10:04 AM
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GTgears
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Pete,
SHC is the Euro branding for Delvac these days. Only difference between the two oils you mention is viscosity. PTX has some friction modifiers for cold start shifting. Any of the three mentioned would be fine in your car. Big question would be percentage of track versus street percentages and ambient temps.
Old 06-29-2016, 04:13 PM
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pete95zhn
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SHC it is. Thanks Matt!



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