 Gear oil 75W-90 - Synthetic or Not? |
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| surfdogskier |
 Dec 1 2020, 08:46 AM
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#1
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Member  Group: Members Posts: 164 Joined: 20-May 16 From: East TN Member No.: 20,019 Region Association: None  |
Hey guys, my ride has started having issues going into gears cleanly. I hope it is just the gear oil. I have never changed it since finally getting her running so I expect it to be quite old. I got it all drained.
My question. Should I use synthetic or not. Back 15 years ago on posts, it read don't use but then I find others saying they are. I figured synthetics have gotten a lot better since then. I bought synthetic but having my doubts until I here some recent opinions. I purchased Synthetic 75W-90 GL-5 Gear Oil. 3 quarts. |
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| Steve |
Dec 1 2020, 08:53 AM
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#2
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914 Guru Group: Members Posts: 5,857 Joined: 14-June 03 From: Laguna Niguel, CA Member No.: 822 Region Association: Southern California 
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Never use synthetic in a Porsche 901,914 or 915 transmission. It’s too slippery for the synchros. Use standard 90 weight gear oil.
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| surfdogskier |
Dec 1 2020, 09:04 AM
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#3
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Member Group: Members Posts: 164 Joined: 20-May 16 From: East TN Member No.: 20,019 Region Association: None |
QUOTE(Steve @ Dec 1 2020, 09:53 AM)  Never use synthetic in a Porsche 901,914 or 915 transmission. It’s too slippery for the synchros. Use standard 90 weight gear oil. That is what I needed to know. Swapping it out today....Thanks! |
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| Mikey914 |
Dec 1 2020, 12:39 PM
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#4
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The rubber man Group: Members Posts: 12,767 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None
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One place cheaper is better! Don't see that too often.
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| mlindner |
Dec 1 2020, 02:36 PM
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#5
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Senior Member Group: Members Posts: 1,667 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest
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Again, read any of Dr. Evil's comments on this. Dino oil only. No synthetic.
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| Bulldog9 |
Dec 1 2020, 02:47 PM
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#6
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Senior Member Group: Members Posts: 705 Joined: 21-August 13 From: United States Member No.: 16,283 Region Association: MidAtlantic Region |
I've been using Swepco 201 in my transmission. Made an immediate improvement, and it just keeps getting better and better.
I have a buddy who swears by Redline heavy shockproof, but it is synthetic. |
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| surfdogskier |
Dec 1 2020, 04:35 PM
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#7
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Member Group: Members Posts: 164 Joined: 20-May 16 From: East TN Member No.: 20,019 Region Association: None |
QUOTE(Mikey914 @ Dec 1 2020, 01:39 PM) One place cheaper is better! Don't see that too often. Definitely true there....It was half the cost when I swapped it out. |
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| Mark Henry |
Dec 2 2020, 11:23 AM
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#8
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
This is close to 20 years ago but I did have OK luck with Kendall semi-synthetic.
I prefer Kendall but any cheap dino will do. The only thing I liked about swepco was the pretty blue dye made it easy to spot a trans leak. IMHO it made shifting worse, but I still like the 101 grease. |
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