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Pops
Trainee


Joined: 15 Jul 2016
Posts: 91
Location: West Sussex


PostPosted: Mon Oct 01, 2018 7:40 pm    Post subject: Transfer Case - 2013, 958 Diesel S - 79,000 miles Reply with quote

Recently, I had started to notice a bit of slippage in second gear, characterised by what appeared to be a stuttering / missing sensation when warmed up. I have read that the transfer box / cases can be problematic on the Cayenne and Macan but the more I investigated, the more it appeared that the transfer case fluid was suspect and / or prone to moisture contamination.

There is a good diy how to change the transfer case fluid over on Rennlist so I dug out the all important tools, a 3/8ths 8mm Hex (allen key) socket, a torque wrench, replacement fill and drain plugs, a couple of litres of Ravenol TF-0870, meeting Porsche's specification and an oil drain pan.

On draining the old, so called lifetime transfer case fluid, it was apparent that this had degraded, was dark, almost black in colour, with a thin viscocity. The fresh Ravenol fluid was gold in colour and had a noticeably thicker viscocity.

When tightening up the drain and fill plugs it is vital not to overtighten these as the transfer case alloy is thin and will crack if too much pressure is applied. Best to use an accurate 3/8ths torque wrench and only tighten up to 20 Nm or 15 ft/lb.

Once the fluid was replaced it was apparent how noticeable the improvement was. No more slipping and everything seemed a lot smoother. On returning from my lengthy test drive I checked the fluid level again, in case there were any air pockets from the fluid change and topped it up.

The Ravenol Transfer Case fluid is only £15 per litre (you will need just over 1 litre) and only takes about 10 minutes to drain and refill if your vehicle has air suspension and you can clamber underneath with it on its highest setting! In future I am going to be changing this at every maintenance service, as a precaution.
 
  
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deMort
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Joined: 21 Mar 2015
Posts: 5756
Location: Brighton


PostPosted: Mon Oct 01, 2018 7:46 pm    Post subject: Reply with quote

You are correct .. its not changed very often .

Im a little concerned though by the colour so i would like to ask a favour .. check it in 3-6 monthes time and see if its still pretty clear .. if so its all good .

Transfer box faults whilst rare do happen .. its nearly always a new box ... changed one 2 monthes ago with a customer complaint of lack of power on boost and poor gear shifts ... 2009 car .
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Pops
Trainee


Joined: 15 Jul 2016
Posts: 91
Location: West Sussex


PostPosted: Mon Oct 01, 2018 8:13 pm    Post subject: Reply with quote

deMort wrote:
You are correct .. its not changed very often .

Im a little concerned though by the colour so i would like to ask a favour .. check it in 3-6 monthes time and see if its still pretty clear .. if so its all good .

Transfer box faults whilst rare do happen .. its nearly always a new box ... changed one 2 monthes ago with a customer complaint of lack of power on boost and poor gear shifts ... 2009 car .


Thanks. I shall check the new fluid in a few months as you suggest, but will change it again anyway at 100,000 miles as a precaution if no problems arise before then.
 
  
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swisstony
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Joined: 27 Sep 2018
Posts: 78
Location: Buckinghamshire


PostPosted: Tue Oct 02, 2018 8:29 am    Post subject: Reply with quote

we have a 2005 Cayenne S and although it has service history, the last few years have been patchy to say the least so what you have described is certainly worth keeping in mind on ours if the same happens.

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