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Old 10-31-2014, 02:16 PM   #1
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PDK oil service

I have a 2003 Boxster S with 28,500 miles.
I have read that the PDK transmission holds 9 liters of oil, yet a service change requires only 3.5 liter replacement. I have no idea if the transmission service has been performed, but I suspect not. It works fine.
I have read cautions of mixing oils and refreshing only 1/3 of the oil seems off to me.
I am coming onto my 30K mile service and want the trans oil/filter changed. Is it the normal maintenance procedure to do a filter, gasket and 3.5 liter of oil or should I insist on a total flush and refill of 9 liters?
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Old 10-31-2014, 03:02 PM   #2
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Hmm. The PDK wasn't available until 2008. Assuming that you meant 2008/PDK, then there are two types of fluid that are used in the PDK gearbox:

PDK transmission oil - approx. 3.12 quarts ATF transmission oil Mobilube PTX Formula A (SAE 75W-90) GL 4.5 - change at 120K miles or 12 years

PDK clutch oil - approx. 5.49 quarts Pentosin Gear Oil FFL 3 - change at 60 K miles or 6 years

Looks like you need the PIWIS to perform the check after refill.

Oil filling
• The correct hydraulic oil level is important for operating the transmission without running into problems. The following preconditions must be met in order to check or correct the oil level:
• Engine must be idling
• Vehicle must be horizontal in both longitudinal and transverse axis
• Hydraulic oil temperature between 86 F. and 104 F. (30 C and 40 C)
• Selector-lever position “P”
• Clutch cooling volume flow must be switched off (using PIWIS Tester in Oil fill mode)
• Retain the described states for approx. 1 minute to allow the oil to settle
• Open screw plug on oil overflow bore and collect emerging oil until only drops of oil are emerging
• Once there is no more oil emerging, top up the clutch fluid until oil emerges at the oil overflow bore
• To avoid damaging the clutches, the procedure must be completed within 5 minutes (PIWIS Tester exits Oil fill mode automatically after 5 minutes)

This is a good link: PDK / Gear oil - 997-2 Series (Carrera, Carrera 4, Carrera 2S, Carrera 4S, Carrera GTS, 911 Speedster) - RennTech.org Forums
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Last edited by thstone; 10-31-2014 at 03:12 PM.
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Old 10-31-2014, 03:08 PM   #3
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Deleted - double post - my computer is going crazy.
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Old 10-31-2014, 03:41 PM   #4
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Originally Posted by thstone View Post
Deleted - double post - my computer is going crazy.
No, its just you....
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Old 11-01-2014, 07:32 AM   #5
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Thanks, Thstone, for the info. My initial post shows how new I am to the Porsche world. I should have said my Boxster has a Tiptronic auto/manual transmission. Any advise for me now?
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Old 11-01-2014, 10:18 AM   #6
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Originally Posted by BubblesinAZ View Post
Thanks, Thstone, for the info. My initial post shows how new I am to the Porsche world. I should have said my Boxster has a Tiptronic auto/manual transmission. Any advise for me now?
Even easier.

Here is a great DIY on changing the Tip fluid from our Forum owner. This should answer most of your questions; Pelican Technical Article: Changing Boxster Automatic Transmission Fluid - 986 / 987
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Last edited by thstone; 11-01-2014 at 10:21 AM.
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Old 11-01-2014, 10:22 AM   #7
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No, its just you....
You might be right!
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