911SLOW

I prepared this for Dell and his new GT3, but thought to share it with all you DIYers..

NorthVan

Nice, any tips on how to get the oil into the transmission?

Erik

Nice, I thought you just kept on filling until it poured out ? How do you measure the 7mm

LVDell

I use an oil extractor with a reversing function. I use and have had it for 10 years. Works great.

Typically I do the gearbox oil on the lift with the help of a friend where one of us is pumping the fluid out of the extractor and the other is holding the tube in the gearbox.

I have no idea how to do it 7mm below the fill hole as with the 6GT3 the fill was to the bottom of the fill opening. You knew you were done when the gearbox oil starting coming out of the fill hole. When it started to come out I would switch the oil extractor from dispense to extract and extract enough to where it was no longer coming out of the fill hole. I have a hard time believing that the dealer techs, race teams, and weekend DIY'ers do anything other than that method. The area to where the fill opening is very tight so I can't see any special "measuring" tool being used.

THANKS FOR POSTING UP JOHN!

NorthVan

Thanks John and Dell.

Serge944

Just fill it till it pours out. Have a breaker bar handy too - I had to use a 3 footer to break one of my plugs loose.

savyboy

Bent paper clip or piece of wire. This is easy to measure.

plima

From the 996 GT3 Workshop Manual:

Changing transmission oil – GT3
Total capacity: 3.7+0.1 l (MY 2000) or 3.3+0.1 l (MY 2004)
Oil change quantity: 3.2+0.1 l (MY 2000) or 3.4+0.1 l (MY 2004)
Note!
• Use only oils approved for this type by Porsche. See Parts Catalogue.
Draining transmission oil – GT3
1. Remove rear, centre and left underbody trim.
2. Unscrew oil filler plug -1- .
911 Carrera (996)
3. Unscrew oil drain plug -2- and let oil drain off into a suitable container.
Topping up transmission oil – GT3
1. Clean the drain plug and filler plug.
2. Screw in oil drain plug again and top up oil to the bottom edge of the oil filler opening.
Tightening torque: 30 Nm (22 ftlb.)
3. Screw in oil filler plug.
Tightening torque: 30 Nm (22 ftlb.)
4. Fit underbody trim parts.

TRAKCAR

Good to know.

awew911

Quite timely since I'm going to tackle this project tomorrow on my 997.1 GT3 RS. Thanks for posting the details. Going to pump in 2.5 liters of Mobilube PTX and measure with a paper clip.

BTW - how are you torquing down the fill plug? I bought a 10mm torque extension (2" and will adjust torque setting accordingly) to use on the 10mm hex key.

Fisher

Couple of years ago, Enthusiast did a writeup.
https://rennlist.com/forums/gt2-and-...ferential.html

900.123.118.30 ----- sealing ring, aluminum (need two)

Fisher

Anyone use Swepco 201? Interesting article on the LN Engineering website:

http://www.lnengineering.com/store/c...61aca3edd00dfe

"Mobilube SHC, also known as Mobil Delvac Synthetic Gear Oil, is the factory fill from Porsche on factory cars and is different from Mobil 1 Synthetic gear lube typically sold at local auto parts stores. We recommend this gear lubricant in G50 and later manual gearboxes (or any gearboxes calling for a GL5 lubricant) for both aircooled and watercooled Porsches without limited-slip differentials. Not a limited slip gear lubricant! Although also compatible with earlier Porsche gearboxes, Swepco 201 is a better choice for these gearboxes in our personal experience (including 901 and 915, as well as VW manual gearboxes)."

I've heard that Neo 75-90 RHD is a good choice for harsh environments like tracking. just sayin.

Another comment by LN Engineering, "It is worth noting that Porsche went to SWEPCO when they were having gearbox longevity issues, which led to the development of 201 specficially for Porsche."

LVDell

Oil gearbox oil I use is Mobil Delvac 75W-90: LINK



Taken from the page writeup:
The replacement for the Mobilube 75W-90 SHC gear lube. Delvac has been market name used in USA towards the semi/fleet maintenance market segment. Hard to find in gallon containers, but we stock it.

Original fill in 996/997 GT3/Cup cars, and GT3Rs. Works well in all 901, 915, G50, G96 gearboxes. Used extensively in Porsche Motorsport products in every grueling test there can be LeMans, Sebring, Daytona, etc. We also use it in our service department in all street and race cars. Works in cars with or without (LSD) limited slip differentials.

Great lube, surpasses all others in research and development.

Mobil Delvac 75W-90 is a fully synthetic drivetrain lubricant engineered to meet the most demanding extended drain and OEM warranty requirements. These products are designed for use in heavy duty drivetrains that require gear lubricants with excellent load-carrying capability and where extreme pressures and shock loading are expected. The state-of-the-art technology in Mobil Delvac 75W-90 delivers unequalled performance for low and high temperature applications, including outstanding oxidation stability, wear protection, corrosion resistance, improved shear stability, extended service capability, and excellent fuel economy.


meets or exceeds the following industry requirements:
API GL-5
API MT-1
SAE J2360

This is NOT the same formula that is available in mass market auto parts stores in quart bottles.

Sold in 1 gallon containers.

AudiOn19s

Savy, good call on the paper clip. Like othes I was wondering how the heck to measure the 7mm but that's a pretty good idea. Tedious but acceptable.

John, thanks for the write-up, I've got Delvac sitting in the garage and I need to do this before it gets any colder around here (not that I'm actually driving the car right now though)

Grizfish - I had Swepco in my old C2 and it was almost impossible to shift the car when the gear box oil was cold in cold weather conditions. During the warm summer months it was great but winter not soo much. Went back to Delvac on that car with no issues or complaints.

GTgears

The single most important piece of information that I see in John's wonderful How-To manual is that he puts loosen the fill plug before drain the gearbox in his instructions. I don't know how many DIYers have had to have their cars towed to the dealer over the years because they drained the box and then for some reason or other couldn't get the fill plug out...