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If it ain't leaking, don't touch it. Gearbox oil was a lifetime fluid according to a few folks I've talked to. Master tech said the engineers designed the gearbox with slow component breakdown in mind.
If it is leaking however, I've replaced some that has leaked out of mine (a '92 900S too!) with 10W-30 that is non-synthetic aka good old dinosaur oil. If you are gonna replace it, you'll need a differential cover gasket and some thread sealant as that's the only place you'll be able to drain the gear oil efficiently. They eliminated the oil drain plug in the later year C900's (apparently cause folks were draining gearboxes when they thought they were draining engine oil).
As for a full change, Rob at Scanwest recommend I put in either 10W-30 or Redline MTL Gearoil in mine (bottle says MTL, NOT the MT-90).
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
- 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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