Zookie

I want to change the Gear Oil in my Trans, I am at 105K on it since last changed at 90k not going to wait till 144k Interval like Porsche says. Last time was does at Porsche with OEM Fluid.

Which Gear Oil shall I use? car is a DD with Track Time and Cold Canada Winter days.

Porsche?
Motul?
Mobil 1 Delvac?
Mobil 1 Mobilube PTX?
Liqui Moly?
Redline?
Fuchs?
Eneos?
Royal Purple?

Also OEM Porsche Fluid is repackaged Liqui Moly? or Mobil 1 Delvac or Mobilube PTX?

dgjks6

Spent a lot of time researching this. I assume you mean the manual trans. The only approved is the porsche OEM and one other I could not find to buy. They do not say waht spec it is, just porsche special.

Some people are using the mobile 1 synthetic

Also redline has one they say is approved but is it the same price as the OEM.

Renntech has lots of info.

Kalashnikov

Any synthetic gear oil of the recommended weight will do just fine. The "porsche approved" is a marketing BS. You are really over-thinking this.

On my car, I put Royal Purple in the differential after I got, it works fine.

LexVan

Mobil Delvac 75W90. Send a sample of your drain to Blackstone for a UOA.

Macster

If you changed the fluid at 90K and it only has 15K miles on it it is premature to change the fluid again this soon.

But if you want to…

Since the OE fluid has gotten the tranny to 105K miles with no issues I fail to see what you can gain by switching away to another (need I say unapproved?) fluid at this time.

Furthermore, I fail to understand why every one it seems is so willing to offer up their car as a test bed to test some other fluid. I do not know what is to be gained and the risk is an expensive transmission rebuild or replacement should the replacement fluid be inadequate.

The OE fluid certainly isn't inadequate. My 02 Boxster's 5-speed has covered over 277K miles with just scheduled transmission fluid changes using the stuff dispensed by the dealer's service department. Takes less than 3 liters and 0.3 hours labor. The Turbo requires a bit more fluid and a bit more labor but its 6-speed is up to 118K miles and will continue to receive regular changes of the OE fluid.

Maybe you ought to wait until someone else runs Redline or Royal Purple 277K miles with no transmission issues before you switch?

LexVan

The OP's car sees track time. So the early change interval is a wise move.

I agree with the remainder of your post.

Zookie

Lol no first time was changed at 90k car now has 195k on it so I have put 105k since so I am due

jeffm

Is this possible without jacking up all 4 corners of the car?

LC MotorSports

Mobil Delvac 75W90

fpb111

If you use this be ready for very hard shifting when the trans is cold.

The Motul 300 75W/90 worked well for me.
http://www.powersportsuperstore.com/...tm?Click=35177

onewhippedpuppy

Motul 75W/90 here, no complaints.

LC MotorSports

That is not true at all.... We use it in all our customer cars. No one has ever experienced very hard shifting. Especially here in CNY were you have Extreme cold temps both in the early spring and late fall driving season.

If you check with many of the indie shops they are using 1 of 3 options.

OEM replacement: Mobil
DE Track/DD: Motul
Heavy Track: Redline (we have a special mix ratio we use for track cars)

At the end of it all it really is how much you want to spend and how often you change the fluid.

If you car is only sees a fluid change every 100k... then the Mobile option best suites the situation.

mhariush

I am about to do the same and I was going to use Swepco 201 80/90. Is this not a good idea for my 99?

JasonAndreas

Actually there is a pretty substantial cold weather difference between "Porsche Approved" Mobilube-PTX and "Porsche Approved" SHC/Delvac.

I had no experience with the G96.00/.30 back when I was living in the Berkshires (not that far from you) and I realize these are just a slightly different Porsche transmissions but the G96.96, G50.05 and G50.20 all were horrible during the winter with Delvac until the gearbox came upto temperature. I remember even having to double-clutch the G50.05 when it got really cold!

LC MotorSports

the g50.05 is a different animal to the g96 when it comes to cold weather reaction.