Best 5-Speed Gear oil and Why ... - Rennlist - Porsche Discussion Forums

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View Poll Results: Manual Transmission Gear Oil and Why ...
Amsoil
2.17%
Mobile 1
13.04%
Royal Purple
9.78%
Swepco
5.43%
Valvoline
4.35%
Lucas
0
0%
Pennzoil
1.09%
Quaker State
0
0%
Castrol
7.61%
Red Line
36.96%
Coastal
1.09%
Whatever Kibort uses
2.17%
Whatever Kibort does not use
1.09%
Other
7.61%
What Greg Brown says ...
7.61%
Voters: 92. You may not vote on this poll

Best 5-Speed Gear oil and Why ...

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Old 10-10-2011, 03:57 AM
  #1
Andre Hedrick
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Default Best 5-Speed Gear oil and Why ...

What do you use an why?
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Old 10-10-2011, 04:00 AM
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Rob Edwards
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Mobil 1 75W90. 'Cause Greg sez so.
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Old 10-10-2011, 04:02 AM
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Andre Hedrick
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Originally Posted by Rob Edwards View Post
Mobil 1 75W90. 'Cause Greg sez so.
Wait for the POLL!
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Old 10-10-2011, 04:16 AM
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Charley B
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Originally Posted by Andre Hedrick View Post
Wait for the POLL!
Poll this, Mister.
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Old 10-10-2011, 06:13 AM
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Valvoline Duragear 75W/90 in the GTS and it shifts fine.

Castrol Transmax 75W/90in the 82S after some experimentation and it gives the best synchro performance ... rebuilt new synchro box.

Now I'll try voting twice!

Edit: It won't let me ... voted Valvoline and still need to vote Castrol.
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Old 10-10-2011, 08:13 AM
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I have used royal purple, Mobil 1 and lastly Red Line. The Red Line seems to work best.
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Old 10-10-2011, 09:16 AM
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I tried Redline in my Beemer gearbox and has almost ruined my syncho's. I went back to Castrol. In this case Castrol Syntrans. It's smooth like butter now. I'll change the bad quality Redline in my 928 as soon as possible. I personally hate the stuff. Anybody wants Redline gearbox oil with only a few 100 km's done on it? up for grabs!
So my vote goes to Castrol!
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Old 10-10-2011, 03:51 PM
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gear oil????? Where do I put that stuff......The Estate prefers no name whatever ATF & lots of it.....I think the last one was valvoline...

But I do have Amsoil severe gear in the diff......
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Old 10-10-2011, 04:10 PM
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Redline...shifts like butta. Tried Mobil 1...too notchy and doesn't lobe synchros well enough.
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Old 10-10-2011, 04:11 PM
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Originally Posted by Bart-Jan View Post
I tried Redline in my Beemer gearbox and has almost ruined my syncho's. I went back to Castrol. In this case Castrol Syntrans. It's smooth like butter now. I'll change the bad quality Redline in my 928 as soon as possible. I personally hate the stuff. Anybody wants Redline gearbox oil with only a few 100 km's done on it? up for grabs!
So my vote goes to Castrol!
I question if you put the correct Reline fluid in the BMW.

I've tested Royal Purple, Redline, Mobile 1, Swepco....and a few others in my 928's and my fathers Ferrari.

I'm sticking with Redline for everything and Royal Purple as a runner up.

The Corvette racing team I'm on we use RP.
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Old 10-10-2011, 04:30 PM
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Redline 75W-90NS for us in the track car. Noticeably improved shifting over Mobilube 75W-90 as well as Mobil 1 75W-90 (not sure of the difference in those two) when the trans was working at high temps. Trans did not have LSD, still debating on what cocktail to use once I get the new trans installed with LSD.
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Old 10-10-2011, 10:51 PM
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My '82 was getting pretty notchy going into 2nd. Tried Mobil 1 - no help. Next tried Swepco - based on Devek's recommendation - made the car almost undriveable. Finally switched to Red Line 75W-90NS - ahh, nirvana (well it shifts better anyway).

MB, just emailed Red Line for their recommendations for my '89 with limited slip. Their rep recommended straight Red Line 75W-90NS (which he says contains a small amount of friction modifier). If you are still getting "chatter," then you can add 1 to 1 1/2% friction modifier (which is about an ounce).

Straight 75W-90NS cured the chatter in my dif.

By the way, the last time (12/10) I bought Red Line gear oil it was $8.25/quart. Now it's $14/quart at the same distributor.

James
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Old 10-10-2011, 11:06 PM
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I put straight Red Line 75W-90NS in my limited slip 5-speed and got chatter - added a bit of the friction modifier and all is well....with the limited slip - I have bad synchros, and the Red Line helped them a bit.
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Old 10-10-2011, 11:34 PM
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I used and loved Kendall 75-90 before it got really hard to obtain. Now I use Mobil 1. As I mentioned at Sharktoberfest, I've had a few customers use Redline in their new gearboxes and the seals leak. Changing to Mobil 1 cured these leaks. Perhaps after the seals break-in Redline would not leak?
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Old 10-11-2011, 12:29 AM
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No leaking on my '82 after about 40k miles. Just added to my '89, so we'll see....

Of course these are not new boxes.

James

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