Don Ivey

Probably been beat to death, but I currently have Swepco in my '87 and hope a move to Synthetic will improve shifting, especially cold. Any suggestions for upgrade? Thanks,

Don Ivey
'87 Carrera

Amber Gramps

Don, We talked about this several months ago. I switched to Kendal synthetic and used the LSD addative. Huge differance. Try searching terms like: Kendall, LSD, G50, synthetic. The specific type of synthetic is mentioned once or twice.

EDIT: here is the best thread on the subject. It gets good after 5 or 6 pages....

https://rennlist.com/forums/showthre...ight=synthetic

Marty916

For what it's worth, I use Redline in my G50 and have been very pleased with the performance. It had the typical case of G50 rattle which the Redline improved noticably. No problems with shifting cold or hot.

gbailey911

When I bought my 87 Carrera 6 years ago, I proceeded to service everything on the car since I didn't have the greatest records from the previous owner. One of the first things I did was change the oil and transmission fluid. I mistakenly put Swepco(misinformed) in the transmission and noticed a dramatic change in the ease at which I used to shift the transmission. After posting on this site, I was told the G50 transmissions don't like the Swepco lubricant, specifically the syncros, and was told to try a synthetic fluid like Mobil One or Redline. I changed it the next day and my car has shifted smooth as silk ever since. I would highly recommend the Mobil 1 transmission lubricant.

Ian Ledger

Yes, agreed. I put Mobil 1 in my 1987 Carrera, and am still impressed at the transformaton in smooth changing and much less transmission noise.
Ian

imcarthur

I too have read that Redline NS or Mobile One are the preferred suspects. Redline works fine for me. Still notchy when cold but smooth thereafter. Next time I'll put in Mobile One just to see if there is any difference.

Ian

Daniel Dudley

I was under the impression that Redline NS was specifically for 915 and earlier boxes with the Porsche syncros.

imcarthur

No. Swepco is the 915's elixir.

You want syns like Redline or Mobile for G50s. NS is for non-lsds.

I'll look for some threads . . .

Ian

imcarthur

As promised here's a thread . . . Pelican Link that just came up. Steve @ Rennsport Post #4.

Ian

MDL

Interesting. I have extensive service records for my 88 G 50. It had Swepco in in when I bought it and the trans felt very notchy compared to what I was used to with my Muncie M 20 4 speed in my Camaro. This is my first Porsche and I just thought from all the reading I had done mine was normal. I too changed oil and trans fluid before my first DE and used the Mobile 1 in the trans. In my case it is like night and day. The Mobile 1 lets the trans shift MUCH SMOOTHER than with the Swepco. I'm not disputing Steve W or anyone else's word that one is better than another. In my G 50 the Mobile 1 makes for a much smoother shift.

BTW, I do not have LSD

imcarthur

Ian Ledger

No, my BMW 540i, 2000 vintage is very agreeable as well. Rolls a lot more, but is very quiet at high speeds, apart from the V8 sound!
Ian

Steve Weiner-Rennsport Systems

We use Mobil 1 Delvac (they used to call it SHC) 75w-90 for G-50's.

Everything else (901-915-930) gets Swepco.

Simple as can be,...

imcarthur

Hello Steve. Glad you joined the thread. I hope you don't mind me 'quoting' you.

Ian

Doug Hillary

Hi,
I can't comment about the G50 box but I know the lubricant Steve mentions very well

M1 Delvac 75w-90 is a very durable lubricant. I ran it for 1m kms (620k miles) oil change intervals in a number of my heavy trucks (Class 8 ) diffs
At regular Used Oil Analysis it had always retained its viscosity and it never lost its Anti Wear and Anti Corrosion (TBN) abilities