 Which Transmission Fluid, Use? Suggestions? |
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| StarBear |
 May 14 2024, 09:10 AM
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#1
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Senior Member  Group: Members Posts: 1,910 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States 
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74 1.8 with original transmission.
What is the best fluid to use - either top off or replace? It now has a Swepco, though don’t recall which one (thought I wrote it in my notes but can’t find it). A small seal leak, so like to top it off at the start of each driving season. (IMG:style_emoticons/default/driving.gif) |
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| nditiz1 |
May 14 2024, 09:14 AM
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#2
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Senior Member Group: Members Posts: 1,191 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region
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After Dr. Evils rebuild class I use 2 supertech (walmart) and a lucas gear oil.
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| Superhawk996 |
May 14 2024, 10:19 AM
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#3
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914 Guru Group: Members Posts: 5,891 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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GL-5 rating is what matters.
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| dr914@autoatlanta.com |
May 14 2024, 10:24 AM
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#4
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914 Guru Group: Members Posts: 7,894 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
80/90. years ago quaker oil made a special vw/porsche lube we used to put in all of our air cooled Porsche transaxles. Swepco is good but expensive overkill unless you are running the track
QUOTE(StarBear @ May 14 2024, 08:10 AM)  74 1.8 with original transmission. What is the best fluid to use - either top off or replace? It now has a Swepco, though don’t recall which one (thought I wrote it in my notes but can’t find it). A small seal leak, so like to top it off at the start of each driving season. (IMG:style_emoticons/default/driving.gif) |
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| bossboy302 |
May 14 2024, 10:37 AM
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#5
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Member Group: Members Posts: 77 Joined: 13-December 21 From: NorCal Member No.: 26,158 Region Association: None |
Swepco 201 baby!!
Best I've used in 50 years. Began in '73 with '67 911S. In every manual Porsche since. Also use in vintage muscle car manuals, including historic race cars. It just plain works that good! |
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| ClayPerrine |
May 14 2024, 10:46 AM
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#6
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Life's been good to me so far..... Group: Admin Posts: 15,514 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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I run 85/90 gear oil. I used to run Swepco, but I found that stuff would leak out of the vent on the top of the transmission. So you end up losing gear oil even with all the seals intact.
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| StarBear |
May 14 2024, 11:03 AM
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#7
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Senior Member Group: Members Posts: 1,910 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States
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All great advice. Thanks ever so much! (IMG:style_emoticons/default/smile.gif)
Now a thread in the record for future searches. (IMG:style_emoticons/default/piratenanner.gif) |
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| cdn914 |
May 14 2024, 11:47 AM
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#9
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cdn914 Group: Members Posts: 194 Joined: 15-March 04 From: Winnipeg, Canada Member No.: 1,801 Region Association: Canada
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QUOTE(bossboy302 @ May 14 2024, 08:37 AM) Swepco 201 baby!! Best I've used in 50 years. Began in '73 with '67 911S. In every manual Porsche since. Also use in vintage muscle car manuals, including historic race cars. It just plain works that good! I couldn’t agree more. |
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| NARP74 |
May 14 2024, 02:25 PM
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#10
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Senior Member Group: Members Posts: 1,073 Joined: 29-July 20 From: Colorado, USA, Earth Member No.: 24,549 Region Association: Rocky Mountains |
Not sure if I am proud or disappointed that no one mentioned the transmission... George sort of did.
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| JamesM |
May 14 2024, 03:12 PM
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#11
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Senior Member Group: Members Posts: 1,915 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
QUOTE(StarBear @ May 14 2024, 07:10 AM) 74 1.8 with original transmission. What is the best fluid to use - either top off or replace? It now has a Swepco, though don’t recall which one (thought I wrote it in my notes but can’t find it). A small seal leak, so like to top it off at the start of each driving season. (IMG:style_emoticons/default/driving.gif) The cheapest 80/90 85/90 you can find. I have found sweepco to make boxes worse, same with synthetics. Not that its a bad product, just that the syncros in these boxes benefit from slightly more drag in the oil. |
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| Geezer914 |
May 14 2024, 04:29 PM
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#12
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Geezer914 Group: Members Posts: 1,442 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States
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Kendall NS-MP GL-5 Hypoid gear oil 80W-90. Great stuff!
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| BENBRO02 |
May 14 2024, 06:41 PM
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#13
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Member Group: Members Posts: 482 Joined: 6-March 15 From: Nokesville, Virginia Member No.: 18,493 Region Association: MidAtlantic Region
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QUOTE(JamesM @ May 14 2024, 05:12 PM) QUOTE(StarBear @ May 14 2024, 07:10 AM) 74 1.8 with original transmission. What is the best fluid to use - either top off or replace? It now has a Swepco, though don’t recall which one (thought I wrote it in my notes but can’t find it). A small seal leak, so like to top it off at the start of each driving season. (IMG:style_emoticons/default/driving.gif) The cheapest 80/90 85/90 you can find. I have found sweepco to make boxes worse, same with synthetics. Not that its a bad product, just that the syncros in these boxes benefit from slightly more drag in the oil. I agree, my transmission shifted better with the regular cheap stuff. I think Swepco is a little too slippery or thin and doesn’t shift as well. |
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| Krieger |
May 14 2024, 10:40 PM
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#14
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Advanced Member Group: Members Posts: 4,726 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None
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Sta Lube hypoid works great on the street and track
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| StarBear |
May 15 2024, 06:52 AM
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#15
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Senior Member Group: Members Posts: 1,910 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States
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QUOTE(Geezer914 @ May 14 2024, 06:29 PM) Kendall NS-MP GL-5 Hypoid gear oil 80W-90. Great stuff! Ok, next somewhat obvious question: Not sure what was in there before, but been topping off with Swepco. OK to begin mixing by now topping with an 85/90 GL-5 oil? |
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| Tonyooc |
May 15 2024, 07:09 AM
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#16
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1974 2.0 Group: Members Posts: 511 Joined: 6-January 18 From: Fort Mill, SC Member No.: 21,763 Region Association: South East States
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I use Red Line.
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| Superhawk996 |
May 15 2024, 07:38 AM
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#17
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914 Guru Group: Members Posts: 5,891 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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| VegasRacer |
 May 15 2024, 11:26 AM
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#18
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ELVIRA Group: Benefactors Posts: 8,524 Joined: 27-March 03 From: Between Scylla and Charybdis Member No.: 481 Region Association: None 
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Swepco leaked when I tried it in my race car. YMMV
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| AZBanks |
May 15 2024, 11:44 AM
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#19
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Senior Member Group: Members Posts: 1,063 Joined: 7-December 05 From: New River, AZ Member No.: 5,245 Region Association: Southwest Region
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Dr. Evil does not recommend Swepco.
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| 930cabman |
May 15 2024, 11:47 AM
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#20
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Advanced Member Group: Members Posts: 3,144 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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QUOTE(Krieger @ May 14 2024, 10:40 PM) Sta Lube hypoid works great on the street and track (IMG:style_emoticons/default/agree.gif) I have been using Sta Lube (available from NAPA) GL5 and seems to work well. |
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