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Old 04-01-2019, 08:12 PM   #1
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Location: Palm Bay, FL
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Shelf life of TransSynd

Does anyone know if TransSynd has any kind of expiration or do not use past a certain age? Have a partial bottle thats been in RV hatch for a couple of years now. It has been opened but I seal the opening with some plastic wrap before I screw the cap on tight.
Just wondering if its safe to use.

04 HR Ambassador 38 PDQ ISC 330 Cummins,
2016 Chevy Colorado crew cab Z71
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Old 04-02-2019, 07:05 AM   #2
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Allison says it's good for 48 months or up to 300,000 miles in use, so I'd conclude in the bottle it can't possibly expire sooner than it would in the transmission.

Been through all the continental states and provinces. Loving life on the road.
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Old 04-02-2019, 07:34 AM   #3
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I have seen analysis done on 30 year old motor oil which was as good as the day it was put in the can. I think shelf life is forever as it is not subjected to dirt, acids etc.
2007 Monaco Signature Noble III 45' ISX 600HP
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Old 04-02-2019, 08:31 AM   #4
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I wouldn't worry about small quantities like that. It should be good for a long long time, particularly a quality synthetic made with modern methods.

One time, a lot of years ago, I had an experience with a transmission fluid that was left in storage tanks for a number of years. When it was put in MT series automatic transmissions, they would overheat and aerate.
We actually rebuilt some of those units, but noticed if we just changed the oil and filter they were fine. Supposedly, the additives in the base oil were settling out.
Consider this an interesting tale from an old man. I don't know if such a thing could even happen today. Never experienced it since.
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