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Old 04-11-2016, 05:41 PM   #1
Join Date: Sep 2014
Location: Los Angeles, CA
Posts: 86
Transmission Fluid: Mobil Delvac or Porsche factory?

I know how we all hate oil debates but I just want to ask for some opinions.
I will be changing my transmission oil next month, after some long research I have a problem deciding if I should use:

Mobil Delvac 75W-90
Gear oil - Mobil Delvac 75W-90 (1 gallon) – Lufteknic

or the factory:
ORMD-TRANS OIL 1LTR - Porsche (999-917-546-00)

It is for a 2003 Boxster S.
Anyone using Delvac on the their Boxster S?


Last edited by Shred; 04-11-2016 at 06:09 PM. Reason: spellings
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Old 04-11-2016, 05:52 PM   #2
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I always use the factory gear oil.
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
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Old 04-11-2016, 06:29 PM   #3
There Is No Substitute.
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Join Date: May 2007
Location: West Coast
Posts: 3,194
Stick with the Porsche transmission fluid. I know it's expensive, but it's only every 90k miles. People tend to poor shifting with non-OEM fluid.

More info here:

1999 Ocean Blue Metallic Boxster - blueboxster.com

Last edited by rick3000; 04-11-2016 at 06:31 PM.
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