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Hello,
This is not going to help with the discussion of which fluid is best in our cars but it gives a little insite on the difference between the GL 4 and GL 5 designations and the use of Phosphorus to form a sacrificial layer on synchro's which all 3 above formulations have similar amounts of. Incase my link does not work I got this from the Pierce-Arrow Society Service Bulletin. Go to http://www.penriteoil.com go to Help section and choose Knowledge Centre. From the table of contents there pick Car,4WD & Light Commercial. Pick 2.3 Manual Transmission Gear Oils and then pick 2.3.5 Gear Oil Industry Specifications.
I found the article pretty informative on why you don't want to use GL5 fluid in a transmission with yellow metal and explains what it does. Good Luck, Bernie
https://penriteoil.com.au/knowledge-centre/Gear-Oil-Industry-Specifications/83/What-is-the-difference-between-API-GL-4-and-API-GL-5-Gear-Oils/1036
_______________________________________
George Riggin Specialty Automotive
Current Saabs
1993 900 Turbo Conv.
1993 900 Turbo Conv. Auto
2003 9-3 Conv
2004 9-5 Arc Sedan
2005 9-3 SS 4 door
2005 9-3 SS Conv
2007 9-5 Aero Sedan
1986 900 Turbo Conv
A few parts cars also
Posts in this Thread:
- Change manual transmission fluid in my 67k mi '92 900 S?, mb , Fri, 23 Dec 2022 14:06:50
- Re: Change manual transmission fluid in my 67k mi '92 900 S?, Calvin Morrison, Wed, 28 Dec 2022 08:37:59
- Re: Change transmission fluid in my 67k mi '92 900 S?, Bernie , Fri, 23 Dec 2022 14:21:24
- Re: Change transmission fluid in my 67k mi '92 900 S?, mb , Sun, 2 Apr 2023 16:01:07
- Bernie - what frequency of oil change do you like?, Notnoel , Tue, 27 Dec 2022 06:58:31
- Re: Change transmission fluid in my 67k mi '92 900 S?, mb , Fri, 23 Dec 2022 14:26:14
- Re: Change transmission fluid in my 67k mi '92 900 S?, Name Left Blank, Fri, 23 Dec 2022 17:57:19
- Re: Change transmission fluid in my 67k mi '92 900 S?, Saabina , Sat, 24 Dec 2022 10:19:29
- Re: Change transmission fluid in my 67k mi '92 900 S?, JerseySaab , Sat, 24 Dec 2022 05:34:03
- Re: Change transmission fluid in my 67k mi '92 900 S?, mb , Sat, 24 Dec 2022 05:53:54
- Re: Change transmission fluid in my 67k mi '92 900 S?, Rich, Sat, 24 Dec 2022 10:23:43
- Re: Change transmission fluid in my 67k mi '92 900 S?, mb , Sun, 25 Dec 2022 06:28:47
- Re: Change transmission fluid in my 67k mi '92 900 S?, Gjetson, Sat, 24 Dec 2022 14:08:16
- Re: Change transmission fluid in my 67k mi '92 900 S?, Simon S, Sat, 24 Dec 2022 19:49:49
- Red Line, Rich, Sat, 24 Dec 2022 14:57:55
- Re: Red Line, blacksheep , Sun, 25 Dec 2022 05:48:46
- Re: Red Line, Simon S, Sun, 25 Dec 2022 07:54:15
- Re: Red Line, Rich, Sun, 25 Dec 2022 08:46:14
- Re: Red Line, BobD, Mon, 26 Dec 2022 11:56:09
- Re: Red Line, Saabina , Mon, 26 Dec 2022 17:58:19
- Re: Red Line, Gjetson, Tue, 27 Dec 2022 13:26:52
- Re: Red Line, Rich, Tue, 27 Dec 2022 11:11:50
- Re: Red Line, Saabina , Tue, 27 Dec 2022 14:59:00
- Re: Red Line, Bernie , Wed, 28 Dec 2022 15:22:12 <-- Viewing This Message
- Re: Red Line, Notnoel , Wed, 28 Dec 2022 07:44:59
- Re: Red Line, Rich, Tue, 27 Dec 2022 16:08:37
- Re: Red Line, Goblin , Tue, 27 Dec 2022 15:12:10
- Re: Red Line, Rich, Mon, 26 Dec 2022 13:23:57
- Re: Red Line, Simon S, Mon, 26 Dec 2022 05:56:45
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