 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: 5,570 Joined: 14-June 03 From: Orange County, 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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Posts in this topic
surfdogskier Gear oil 75W-90 - Synthetic or Not? Dec 1 2020, 08:46 AM
Mikey914 One place cheaper is better! Don't see tha... Dec 1 2020, 12:39 PM
surfdogskier
One place cheaper is better! Don't see th... Dec 1 2020, 04:35 PM mlindner Again, read any of Dr. Evil's comments on this... Dec 1 2020, 02:36 PM Bulldog9 I've been using Swepco 201 in my transmission.... Dec 1 2020, 02:47 PM Mark Henry This is close to 20 years ago but I did have OK lu... Dec 2 2020, 11:23 AM |
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