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Good morning.

1999 996 manual C2.

Planning on changing the transmission oil. I know the Mobil Mobilube PTX (75W-90) is the recommended by Porsche but is hard to find and whomever has it is about US$40.00 per liter. Shopping arround found this:  

WWW.SUMMITRACING.COM

Find Mobil Delvac Synthetic Gear Oil 122035 and get Free Shipping on Orders Over $99 at Summit Racing! Mobil Delvac Synthetic Gear Oil is engineered to meet the most demanding extended drain and warranty requirements. It's designed for use in heavy-duty drivetrains that require gear lubricants with...

For what I understand is the same product. Also, Is Motul a reliable quality lubricant brand? 

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Over the years, we have replaced more transmission fluid than I care to remember, all for the same reason: they all were the wrong fluid and caused problems (poor shifting, noise, etc.)

 

Porsche has always used unique full synthetic transmission lubricants which were made to their specifications, and for which there were no aftermarket match because the total number of Porsche cars is too small a market, which is why they tend to be pricey and hard to find outside the dealer network.  While some people have had limited success with other products, we only used the Porsche products, and we never had any problems with them.

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