Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
> Gear oil 75W-90 - Synthetic or Not?
surfdogskier
post Dec 1 2020, 08:46 AM
Post #1


Member
**

Group: Members
Posts: 162
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.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Steve
post Dec 1 2020, 08:53 AM
Post #2


Advanced Member
****

Group: Members
Posts: 4,330
Joined: 14-June 03
From: Orange County, CA
Member No.: 822
Region Association: Southern California



Never use synthetic in a Porsche 901,914 or 915 transmission. It’s too slippery for the synchros. Use standard 90 weight gear oil.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
surfdogskier
post Dec 1 2020, 09:04 AM
Post #3


Member
**

Group: Members
Posts: 162
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!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mikey914
post Dec 1 2020, 12:39 PM
Post #4


The rubber man
**********

Group: Members
Posts: 10,763
Joined: 27-December 04
From: Hillsboro, OR
Member No.: 3,348
Region Association: None



One place cheaper is better! Don't see that too often.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mlindner
post Dec 1 2020, 02:36 PM
Post #5


Senior Member
***

Group: Members
Posts: 689
Joined: 11-November 11
From: Merrimac, WI
Member No.: 13,770
Region Association: Upper MidWest



Again, read any of Dr. Evil's comments on this. Dino oil only. No synthetic.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bulldog9
post Dec 1 2020, 02:47 PM
Post #6


Senior Member
***

Group: Members
Posts: 701
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.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
surfdogskier
post Dec 1 2020, 04:35 PM
Post #7


Member
**

Group: Members
Posts: 162
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.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mark Henry
post Dec 2 2020, 11:23 AM
Post #8


that's what I do!
***************

Group: Members
Posts: 19,125
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.
User is online!Profile CardPM
Go to the top of the page
+Quote Post

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 23rd January 2021 - 01:02 AM