klein90

Is it ok to run swepco 201 transmission fluid in the 964 turbo LSD?
Thanks
Mark

38D

Yes it is fine.

C2 Turbo

I just replaced mine with Mobil 1 Syn 75W90 and boy do i feel the difference..

Staffan

I am going to change transmission oil, last time I didn't find the right oil which led to problems, sound from the diff while turning and backing up.
No problems whatsoever with Mobil 1, even when backing up and turning at the same time ?

Edit:
I know it's against one of the 10 commandments, but I want your wheels so bad
They are just stunning!

klein90

Thanks guys always nice to get good tech help.

911 2

hoe did you find the mobil 1 what difference did you notice, did you use silver alloy washers and just fill until the oil came out the top plug

C2 Turbo

The transmission felt bit lose and it also needed some effort to engage but with mobil 1 it feels much smoother now and takes quite a bit less effort too.The tech changed the oil so can't comment on the washer,sorry ?
Staffan,
I'll post some better picts tomorrow.
Later

viperbob

Swepco will work, but with the G50 tranny you will be getting a fair amount of noise (gear rattle). Stay with the Mobil 1 and you won't have this problem.

Bernard

So... should I use Swepco 201 80W90 or Mobil 1 Syn 75W90 in my 91 Turbo?

Only driven in warmer weather. I know its an old post but it came up in my search. Thanks

Metal Guru

Swepco was the ticket in my 911 SC, but the 915 transaxle has the notoriously bad Porsche-designed syncros which needed all the help they could get.
After the failed Delvac experiment, I went to Mobil 1 and I have been very happy with it.

Bernard

Thanks Paul

mel_t_vin

Bernard, I think you should use neither.

Conventional Swepco 201 is the gold standard for both 915.XX and 930.XX boxes. The Getrag-drived G50.XX boxes, utilizing Borg-Warner double-cone syncros, are better suited with synthetic gear oils.

And while the Mobil 1 75W-90 gear oil you referenced above [found at Walmart or your neighborhood FLAPS] is synthetic, my understanding is that it contains various friction modifiers that don't play as well with the BW syncros or the LSD.

Instead, I suggest you find a local Porsche tuner/race shop that can sell you/service your car with Mobil 1 Delvac or simply purschase it yourself on-line. If you speak with any number of subject matter experts, I suspect they would recomment the Delvac, over the common Mobil 1 75W-90, as well.

For those that prefer other brands, Amsoil, Redline, Royal Purple, and others, also make suitable gear oil for the G50.XX/LSD boxes.

Metal Guru

Been there, done that and it was a disaster as well as a waste of money and time.
Delvac does not play well in the G50/52 transaxle with the 20/100 lsd. Delvac is not slippery enough for the diff to work correctly.
I know the guys with G50/50 boxes like it but it doesn't mean it works in a G50/52. Over here, there are a number of "subject matter experts" that will advise against using Delvac.

mel_t_vin

Paul, did not know that.

Do you think the Delvac does not play well with the G50.52 specifically because of its 20% LSD? When you ran Delvac, were you getting unusual/excess chatter in tight turns?

So, if this is the case, then between Delvac and the more easily accessible Mobil 1 75W-90, it would be better to run the 75W-90, correct?

Have you tried any of the Amsoil, Redline, or Royal Purple gear oils? What do you like to run in your box?

Metal Guru

I believe so.
Here's what Mobil 1 has to say about it: http://www.mobiloil.com/USA-English/...ransaxles.aspx

My personal experience, as mentioned before, follows this advice.

I've only run Mobil 1 LS. I've heard good things about Amsoil engine oil and Redline power steering fluid but have never tried their gear oils. I put so few miles on my car that I haven't needed to change gear oil since the Delvac/LS change.