Hi
I am looking at changing the oil on my gearbox (manual 996TT)
Is this possible with drain and refill, and what oil is recommended.
Thanks guys

 

http://www.amsoil.com/mygarage/vehiclelookup.aspx

 

Mobil Delvac synthetic 75w90 gear oil.

 

Good info. here:http://www.renntrack.com/forums/show...hlight=gearbox

 

Thanks all
Is it simply a case of drain and refill to the base of the filler plug ??

 

The Mobilube PTX has NOT been discontinued. It is available in a 20L container through your Porsche dealer who can order it under part number
000 043 204 20. I checked with a friend who is a mechanic at the local Porsche dealer and he pulled up the latest technical bulletin that also has the Shell Transaxle 75w90 as the only other Porsche approved gear oil for the 996tt and is available in 1L bottles under part number 999 917 546 00. Both the Mobilube PTX and the Shell have almost identical properties and are quite different from the Mobil Delvac 75w90 that a lot of guys are using. The PTX and Shell products flow better than the Delvac at low temperatures and have similar viscocities at the higher temperatures. I've confirmed this with the Mobil tech support guys who told me that the PTX was specially formulated to Porsche requirements. BTW, Gbox does not carry Shell. They use Swepco. For what it's worth......

 

Easy as eatin pie! The bottom plug is the drain, I would get the trans up to operating temp then have the front of the car a little bit higher then the rear to get all the oil out. I use Red Line lightweight shockproof synthetic. You need about 4 quarts. You will need a Oil spray gun, looks like a grease gun with out the pump handle and has a clear hose to suck the oil up and push it in the trans with.

 

What is everyone using? I refilled mine with Amsoil product last time, will this be detrimental?

 

There are only two gearbox oils approved by Porsche for the 996tt, mobilube PTX and Shell transaxle. Both are are an almost identical formulation and weight 75w90. Lot of guys use Mobil delvac 75w90 since it's commercially available. I just purchased some mobilube PTX and will be doing the diff/tranny change next week.

 

I refuse to get involved in what I call the Great Gear Oil debate and pick a brand. Just do yourself one big favour, change your gear oil every 10-15K if you drive the car at all hard. If you track it, change it even more often. The factory service interval is a joke. I generally say do it once a year regardless of mileage for street cars.

 

I think i'll get some Mobil 1 75w-90 Syn from autozone and tackle this in the oncomming weeks.

 

Is this the same for 996 GT2? in terms of recommended gear oil and interval? Also any technical differnces to be be aware of? I have a nice built RS gearbox and want to take care of it properly to ensure it's good health over time

 

See the attached pictures. This info is straight out of the 996TT/GT2 Porsche PET parts catalogue. You can check the part number of your manual transmission, with or without LS. Mobilube PTX 75w90 applies to both. Considering the cost of our gearboxes, to me it's a no brainer to take the guess work out of what product to use. I looked at the specification of a lot of the 75w90 gear oils compared to the Mobilube PTX (and Shell Transaxle), and they are both much thinner oils at low temperatures with a higher viscosity index than the regular Mobil 1 75w90 or the Delvac. In other words the OEM stuff flows better at low temps. Will it make a difference? Who knows? But there is probably a reason why Porsche had it formulated the way they did. I'm not educated enough when it comes to oils so sticking with OEM makes sense to me.....

 

John I didn't see any attached pictures buddy

 

Sorry, I realized I didn't attach them but they are there now.