View Poll Results: Manual Transmission Gear Oil and Why ...
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Best 5-Speed Gear oil and Why ...
10-10-2011, 03:00 AM
#2
Archive Gatekeeper
Rennlist Member
Rennlist Member
Mobil 1 75W90. 'Cause Greg sez so.
10-10-2011, 05:13 AM
#5
Rennlist Member
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.
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.
10-10-2011, 08:16 AM
#7
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!
So my vote goes to Castrol!
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10-10-2011, 02:51 PM
#8
Race Director
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......
But I do have Amsoil severe gear in the diff......
10-10-2011, 03:11 PM
#10
Administrator - "Tyson"
Lifetime Rennlist
Member
Lifetime Rennlist
Member
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!
So my vote goes to Castrol!
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.
10-10-2011, 03:30 PM
#11
Drifting
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.
10-10-2011, 09:51 PM
#12
Burning Brakes
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
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
10-10-2011, 10:06 PM
#13
Rennlist Member
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.
10-10-2011, 10:34 PM
#14
Rennlist
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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?
__________________
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
10-10-2011, 11:29 PM
#15
Burning Brakes
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
Of course these are not new boxes.
James
Last edited by jheis; 10-10-2011 at 11:51 PM.
