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panel's Avatar
 
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Ultimate Transmission Oil Thread

I just wondered what everyone was using for their transmissions? Synthetic? GL-4 or GL-5. Brands etc?
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Old 08-07-2009, 09:12 PM
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i don't really think with 64 post under your hood you can start or name "ultimate ...

SWEPCO IS ABOUT IT FOR ANY ON THIS FORUM
Old 08-07-2009, 10:16 PM
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Max Sluiter
 
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Porsche syncromesh = Swepco 201. I think 210 is for 930 gearboxes and for racing (high temperatures and wear and flushed frequently)

G50 = Mobil 1 Delvac


If you have limited slip differentials (clutch type) it requires special oil/additives. Swepco is good for being viscous enough and having enough friction to allow the syncromesh to work properly. The same resistance to shear and higher friction should be good for limited slip differentials.

If you have a clutch type limited slip differential, you must also keep in mind that the oil becomes dirty as the clutches wear- this is how they work. You should change the oil more frequently and consider a cooler for track work to deal with increased temperatures.
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Old 08-07-2009, 11:46 PM
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Quote:
Originally Posted by 80-911SC View Post
i don't really think with 64 post under your hood you can start or name "ultimate ...

SWEPCO IS ABOUT IT FOR ANY ON THIS FORUM
Jesus, the guy has 64 posts to his name, so what?
He has also been a member here since 2002. So he isnt a post whore, big deal.

So with my crappy post count here goes. Just done it and was recommended Mobil 1 by the guy that is just about the top transmission builder in the UK.
Its a G50, for a 915 I wouldnt know.
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Old 08-08-2009, 02:21 AM
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One big bonus of Swepco is that it is easy to figure out if you have an oil leak vs a transmission fluid leak. Plus if you spill it on your hands you can tell your kids that you just squished a smurf.
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Old 08-08-2009, 04:42 AM
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As for GL-4/5 etc., always use what is recommended for you particular transmission as they are not the same. Before the advent of the internet (and hence a total lack of this vast tribal knowledge), I used Mobil1 synthetic in my 915. After finding that Swepco was the way to go (years later), I switched to Swepco expecting to see a noticeable improvement in shifting, etc. I couldn't tell a difference.

Use a good quality, properly rated (GL-5) gear oil and in all but the most extreme cases I think you'll be fine.
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Old 08-08-2009, 06:02 AM
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Metal Guru
 
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I've tried Mobil 1 Delvac and Mobil 1 LS in my G50 with limited slip.
Shifting was smoother with Delvac but the limited slip clutches didn't slip much.
Opposite situation with Mobil 1 LS. Clutches slipped just fine but shifting isn't as buttery smooth as with Delvac.
Next spring I'll try Delvac and GM LS additive.
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Old 08-08-2009, 06:19 AM
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I used Amsoil Synthetic in my 915 and I didn't have any problem. I only had it in there for less than a year. No changes when I went back to Swepco.

I wonder if anyone does oil analysis on their transmissions like they do on their oil. It would be cool to post.
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Old 08-08-2009, 09:00 AM
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Bland
 
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this thread should be in the best oil forum like the other thousand threads on this topic
Old 08-08-2009, 10:46 AM
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The reason I posted this was to separate the two engine and trans into two. Thus everyone doing a search or learning can just read about the one particular part of the car. It was just an idea
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Old 08-08-2009, 07:59 PM
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The thread is a good idea. There isn't much on tranny oil other than "only use Swepco". I don't have any reason to doubt it, but I would like to learn more if anyone has evidence.
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Old 08-09-2009, 02:11 AM
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Redline NS for non-slip G50s works well, too.

Some threads from the past:

G50 Gear Oil
G50 transmission, What gear oil should I use?
Which Red Line Fluid?

Ian
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Old 08-09-2009, 03:45 AM
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Swepco 201 for a 915, especially a new rebuilt one.

I asked the 915 track rebuilder guru if the Swepco 212 for hot track use would be necessary for 110F ambient temp's in U.S. SW deserts during hot summers. The guy said it isn't necessary as the tranny doesn't get that hot on any street use. I don't have limited slip so maybe that will make a difference of 201 vs 212 ?

I think John Walker, aka John Walker's Workshop, uses another brand on the 915 ?

If so that's the only non-Swepco I'd ever try..... period
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Old 08-09-2009, 06:28 AM
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Ron, have you always used Swepco or did you switch to it at some time?
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Old 08-09-2009, 06:45 AM
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