jdgamble

Interesting on pan situation. Thanks for the PN. That will come in handy with the dealership when discussing price.

IzzyCab

It's my understanding that you need a PWIS to engage the clutches to get out all the oil. I wanted to do this at a indie shop but I just have to bite the bullet and have it done at the dealer

Tj40

I believe there is also a procedure to get the oil at a specific temperature - from Slicky Rick....


Ok gentlemen. Just for additional knowledge of all. I've done my clutch oil and gearbox oil change. Drain both oils. My dealer drained overnight. If doing gearbox oil, which I did as it removed assembly dirt etc., fill gearbox with the correct lubricant in the normal mode. Then pre fill clutch oil with around 2 liters of the oil. Start engine to bring clutch oil to correct temp of 30 to 50..then use piwis to go into fill mode. Fill mode does not last 5 minutes to protect the gearbox when in fill mode fill clutch oil till it overflows from the filler hole. That's it!!
Gearbox quieter, smooth shifts....performance improvement noticed!


https://rennlist.com/forums/997-foru...replace-2.html

verboten

People have been mixing oils for years without a problem, especially with the latest synthetics. In addition, so far everyone has said the PDK filter was perfectly clean.

I say go for it...2 litres is 40% of the total capacity, and if you change again your at over 60%.

frankyluis23

Wouldn't they have to drop the pan to find out if the filter is clean? Using a borescope to look at the filter is silly especially when 85% of the filter is not visible (The filter housing on the pan covers most of the filter).

How do you know a filter is clean?

syzygy333

franklyluis, I backed out of this scheme a few posts ago. I had the spirit, the initiative and the desire, but alas, not practical.

as I have said, someone will crack the code on this, and figure out how to
get this done without the intervention of an impractical (to own/operate) PIWIS.
probably a Porsche afficianado with tech savvy interest/vocation.
it ain't me, babe.

I will keep my ears/eyes open for info
I am not rich and not poor, but I have always had a desire to do as much of my mechanical work as possible. it's a therapy of sorts, and the satisfaction pays dividends too.
not to mention money saved! mechanics are about 100.00- 150.00 an hour! Sometimes it is necessary to defer to the folks with expertise, special equipment or both.
I never dreamed I could rebuild a transmission by myself, until I did it. or strip/rebuild carburetors, until I did it. it wasn't a PDK for sure (turbo 400).
wrench twisting is in my blood

verboten

I finally did the math and a DIY PDK OIL change is possible. A poster - Orange260Z said a dealer changed 3.4 quarts of oil (without a PIWIS Oil Fill Mode). The total PDK oil capacity is 5.5 quarts so 62% of the oil was clean. If you drove the car (mixed the oil homogenously) and changed the oil again (same quantities) you would have 14.5% old oil in the transmission. In order to get the oil sufficiently clean (< 5%) you would only have to change the oil 3 times!

Now, what about the cost: $321 for pan w/filter (only change once), $220 for oil (3.4Q X 3 changes @ $20ea.) and labor is free (DIY). The total is $541, which is $400 less than dealer.

Fined

$400 less than the dealer but you're counting your time an effort at being worth $0.. by that calculation.

orange260z

Just to be clear, mine was done at Mark Motors Porsche Centre Ottawa using PIWIS fill mode. They told me the only way to get more oil out would have been to drop the pan, which they don't generally do.

Ptech1

You guys are missing one major point here with the whole remove this % of fluid, adding this %, then acounting for this %... The PIWIS is operating in a fill mode after bleeding the system and activating the clutches hydraulic system. Therefore, if you aren't adding fluid during that mode as designed, you aren't setting the correct fluid level even if you're within the correct fluid temperature range.
I completely understand the DIY nature of taking care of these vehicles as overall prices drop, but you're still servicing a $90k+ sports car. And taking a chance on damaging a very expensive dual clutch transmission just to save a few hundred dollars. Instead, find a good indie who is capable of doing it for you, or suck it up and pay a dealership.

stronbl

To the OP -

If you are going to do the job, here are a couple docs that you may find helpful - for 997.2. You have read the pros and cons and ultimately it is your decision. Good luck and all the best.

docdrs

Thanks for the info Stronbl


So running thru RND will allow the clutches to be adequately lubricated then using the piwis to shut off the cooling pump and allow oil to settle will cause oil to exit the fill hole or require more oil in the fill hole ? After the tranny was prefilled is the million dollar question.

Looks like a piwis is definitely needed

docdrs

Just read an interesting article on the PDK's manufactured by ZF


http://www.just-auto.com/analysis/zf..._id101268.aspx

All of the 7DT transmissions were developed (and successfully tested) to use a lifetime oil fill, but Porsche decided to err on the side of caution and opted for a 90,000km oil change interval.