is swepco safe for a turbo tranny with LSD

fredmeister · fredmeister's Garage

Have switched the tranny oil in my 930 4 speed with LSD diff from the previous owners (synthetic maybe?) to Swepco 304.......which I know is the preferred oil for 915 tranny's.
I just want to make sure that since this car has a limited slip that the Swepco is still the best oil to use or will it effect the LSD in a bad manner.
New to 930 4 speeds so don't know if Swepco is as beneficial as it was in the non LSD 915 tranny in my 911SC.

Fred

aftermath · aftermath's Garage

bump, I have the same question as Im about to change the fluid

carmad · 09-12-2007, 02:09 PM

I run Swepco, street and track with no problems, I have LSD. Tried Mobil synthetic, took it out as shifting was not as smooth.

juanbenae · juanbenae's Garage

i believe the swepco for the 915 is a 201 product. my tranny was just rebuilt with a guard lsd installed and the swepco 201 was the recommended lube.

T$

Mitch Leland · Mitch Leland's Garage

Howdy,

I just had this same discussion with my Porsche Mechanic who does a lot of race care prep. He said that the Swepco is too slippery for the LSD rear end. He recommended another product, but right now the name escapes me.

I was using Swepco in my tranny with a LSD rear end. However some where some one swap out the rear end for a standard one before I bought the car. Any one have 915 LSD rear transaxle for sale? That's how this whole conversation came up about Swepco and LSD rear ends.

PM me and I can ask him the name...

Geary · 09-12-2007, 05:32 PM

Fred

What is #304? It may be the incorrect lubricant. What you want is definitely 201, as it is LSD friendly, and the correct viscosity for the 930. We just went through this with a customer. His mechanic had switched him over from Swepco to Mobil 1 synthetic in his 930 ..... bad mistake. His synchros couldn't do the job properly, and wore the sleeves and synchro teeth out in short order.

Geary · 09-12-2007, 05:34 PM

Mitch, Your mechanic has also given you bad advice. Put the Swepco 201 back in. Only 203 should be avoided with LSD.

Mitch Leland · Mitch Leland's Garage

Geary,

I'll see if I've got my info correct, maybe he was talkin' 203... Thanks.

Geary · 09-13-2007, 07:41 AM

Some mechanics seem to believe that Swepco is a synthetic. 203 won't allow the LSD to work properly (and likely the 915/930/901 synchros, too).

sand_man · 09-13-2007, 08:32 AM

I run the 201 in my 930 tranny with LSD. No issues and in fact will be performing my second gear oil change with 201 this weekend.

fredmeister · fredmeister's Garage

I meant Swepco 201 just a typo.......
So consensus says it is safe for the LSD, that is good.

JBO · 09-13-2007, 09:09 AM

I have been using Swepco in my 915 and am about to change it to Shell Rotella 80-90 gear oil, as I found some cheap on sale. No complaints about the Swepco, other than availability and price. I'll let you know if it shifts any differently. The guy who rebuilt my trans a few years ago said it will be fine, and any quality lube is OK, as long as it's not synthetic. I think John Walker has said the same thing, and doesn't see the Swepco as anything magical.

David · David's Garage

It's in my 930 LSD, no problem.