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> Transmission Fluid, ????
Drums66
post Dec 21 2011, 07:26 PM
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QUOTE(SirAndy @ Dec 21 2011, 04:30 PM) *

QUOTE(Steve @ Dec 21 2011, 04:28 PM) *
It's funny why Porsche put external oil coolers on 3.2 915 trans in Europe but not in the states. You think it would be generally hotter over here than in most parts of Europe.

Speed limit (or lack thereof). My guess is the cars see a lot more high speed driving in Europe compared to the US.
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Richard Casto
post Dec 21 2011, 09:07 PM
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Regarding heat... In another thread elsewhere it was mentioned (I think by Jake Raby) about the percentage of power loss via a 901 transmission. If I remember correctly it was above 20% which is high, but he had the dyno numbers to prove it. My point is that you have to remember that all of that energy is being converted into heat and noise with most probably being heat. I wouldn't be surprised if the 915 has similar friction losses and ultimate potential for heat generation. And the more power you put in, the hotter is will get. At some point cooling is needed.

Oil is and will always be a religious discussion. And while there is plenty of "opinion" here, I think there is also plenty of "fact" as well. All fluids in a car live a tough life. Some worse than others. At a minimum the factory put in a service schedule for a reason and I suspect the primary reason was to not just sell you more oil at service visits. And about the best empirical data we have is that regular old "dino" or "mineral" oil has worked well for decades in these transmissions.

Otherwise, there is no need (for me) to rehash what has already been said! (IMG:style_emoticons/default/biggrin.gif)

Richard
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Steve
post Dec 26 2011, 11:04 AM
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I need to toss some old oils in the garage, but I stumbled across some Mobile 1 synthetic 75-90 GL-5 oil in the garage. Is synthetic GL-5 bad? Should I toss it? It's probably been sitting on the shelf for 15 years anyway.
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steuspeed
post Dec 26 2011, 02:06 PM
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I'm going back to NON synthetic ASAP! I can barely get it into first gear with SWEPCO. I have to wait for the revs to drop way down getting into second now otherwise the teeth zip because the oil is so slick. It's not the typical grind.
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scott_in_nh
post Dec 26 2011, 08:36 PM
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I had shifting that was about the same as the OP's.

So I drained the swepco and put in Valvolene 80w-90.

I only had time for about a 10 mile drive, but it seems that 3rd-5th shifts are about the same, 2nd is smoother and grind free so far and 1st slides in much easier.

I'll report again after a longer drive or after some stop and go driving in traffic.
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steuspeed
post Dec 30 2011, 01:29 AM
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I could not find Valvoline without the Limited Slip tag on the bottle, so went with CarQuest 80W90 GL5 rated Hypoid gear Oil. $15.97 a gal and shifting way better than SWEPCO.
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442nd914s
post Dec 18 2012, 05:35 PM
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If I can just ask a simple question. And only because Im a newbee. There are 2 plugs on the right side of the tranny. Top one is the FILL and the bottom one is the drain? Is that correct? How many quarts will I need to service it properly.
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Dr Evil
post Dec 18 2012, 06:55 PM
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Hey Dude,

We all have to learn some time. You are correct about the plugs. Use approx 3L of 80w90 GL5 oil and fill until the oil starts to come out of the fill plug.
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steuspeed
post Jan 2 2013, 04:23 PM
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QUOTE(442nd914s @ Dec 18 2012, 03:35 PM) *

If I can just ask a simple question. And only because Im a newbee. There are 2 plugs on the right side of the tranny. Top one is the FILL and the bottom one is the drain? Is that correct? How many quarts will I need to service it properly.


Make sure you can get both plugs out before you drain it. I think the spec is about 15ftlbs, and I had to use a breaker bar to get the drain plug off mine. Some jerk at Jiffy Lube probably used his impact wrench on it. Go with 80W90 GL5 rated Hypoid gear Oil. If it says HYPOID you have the right stuff. If it says synthetic or for limited slip take a pass. Stay away from SWEPCO. It's not designed for old worn transmissions.
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Dr Evil
post Jan 2 2013, 04:57 PM
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ALWAYS take the FILL plug out first. If you drain it and then find out that you can not fill it, you will be bummed.
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mrbubblehead
post Jan 2 2013, 08:30 PM
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after finding out how much it costs for new gearbox parts, i am seriously considering adding a pump, filter, and cooler to my trans...
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Dr Evil
post Jan 3 2013, 05:00 PM
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QUOTE(mrbubblehead @ Jan 2 2013, 09:30 PM) *

after finding out how much it costs for new gearbox parts, i am seriously considering adding a pump, filter, and cooler to my trans...

No amount of oil cooling will fix poor shifting technique or a maladjusted tranz.
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Steve73
post May 27 2013, 01:52 PM
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(IMG:style_emoticons/default/dry.gif) How about SuperTech 80w-90 GL-5 from......Wal-Mart.

Already have some to put in my Bug

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Randal
post May 27 2013, 02:01 PM
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QUOTE(SirAndy @ Nov 5 2009, 01:19 PM) *

Swepco 201 is expensive and the Cap'n will tell you it's no good but i've been running it for years with very good results.

It made a noticeable improvement in shifting from whatever the PO had used. Transmission oil is not really a "wear" item, which makes it easier to justify the extra expense for Swepco.

I cleaned up and re-sealed my 901 about two years ago and it's still bone dry.
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Swepco 201 is great. Like Andy I've been using it for years.

Rich Bontempi (High Performance House) told me about it an put the first refill in my transmission. FUI Rich is also a well know racer and car builder.

Probably the best test of transmission fluid would be the guys running longer events. There are a bunch of people running longer track sessions and their experience would be invaluable.
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0396
post May 27 2013, 04:52 PM
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Like its been said...it's like religion. I've used M1 trans oil, Swepco and the local FLAPS
I've even used a cocktail of M1 with Swepco..I know Swepco cost more but like some have mentioned, if you track your car, why not simply put the one product that saved the 934/935's gear boxes during Porsches finest hr.
.02$
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d962r
post Jun 25 2013, 05:41 PM
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QUOTE(396 @ May 27 2013, 03:52 PM) *

Like its been said...it's like religion. I've used M1 trans oil, Swepco and the local FLAPS
I've even used a cocktail of M1 with Swepco..I know Swepco cost more but like some have mentioned, if you track your car, why not simply put the one product that saved the 934/935's gear boxes during Porsches finest hr.
.02$

So has anyone tried any of the Lucas Oil additives?
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Dave_Darling
post Jun 25 2013, 06:31 PM
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QUOTE(Dr Evil @ Dec 18 2012, 05:55 PM) *
Use approx 3L of 80w90 GL5 oil and fill until the oil starts to come out of the fill plug.


Make sure the car is at least close to level when you do this... Don't ask how I know.

--DD
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monkeyboy
post Jun 26 2013, 12:10 PM
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QUOTE(d962r @ Jun 25 2013, 04:41 PM) *

QUOTE(396 @ May 27 2013, 03:52 PM) *

Like its been said...it's like religion. I've used M1 trans oil, Swepco and the local FLAPS
I've even used a cocktail of M1 with Swepco..I know Swepco cost more but like some have mentioned, if you track your car, why not simply put the one product that saved the 934/935's gear boxes during Porsches finest hr.
.02$

So has anyone tried any of the Lucas Oil additives?


I don't use the additives, but I have used their transmission oil with good results.
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second wind
post Jan 4 2023, 02:29 AM
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QUOTE(monkeyboy @ Jun 26 2013, 10:10 AM) *

QUOTE(d962r @ Jun 25 2013, 04:41 PM) *

QUOTE(396 @ May 27 2013, 03:52 PM) *

Like its been said...it's like religion. I've used M1 trans oil, Swepco and the local FLAPS
I've even used a cocktail of M1 with Swepco..I know Swepco cost more but like some have mentioned, if you track your car, why not simply put the one product that saved the 934/935's gear boxes during Porsches finest hr.
.02$

So has anyone tried any of the Lucas Oil additives?


I don't use the additives, but I have used their transmission oil with good results.


Ok....is it just me or is this thread REALLY CONFUSING??? I believe a 914 is supposed to use conventional GL4 tranny oil....how did it get to this confused controversy that allows GL5? I am getting a headache over all of this double talk.....someone please tell the truth....thank you,
gg
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Front yard mechanic
post Jan 4 2023, 06:16 AM
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Being a ten year old thread you might as well start it up again! I use chicken grease in mine it clucks less from first to second
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