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Additive Fallout / Separation Amsoil Gear Oil #5234771 10/09/19 10:34 AM
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Gannet167 Offline OP
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I just changed my diffs and transfer case oil with Amsoil 75W-90 "Gear Lube". I thought there was a little dirt on the outside of the bottles but looking closely after completing the job, there's a residue inside. I wish I'd noticed this before doing the job. I used a hand pump that draws from the middle of the bottle so likely none of this residue was pumped into the truck. I emailed pictures to Amsoil and they say it's probably additive fallout. The oil had been sitting on my shelf for probably 2-3 years and exposed to some very cold temps. Amsoil says their products have a 5 year shelf life.

Should I be planning to drain and refill with fresh fluid or is this really not a big deal? The gear oil I used was in clear bottles which is why I saw the residue. Had I unused their newer, solid grey colour bottles, I wouldn't have seen the fallout. I suppose I could send a sample for analysis before buying another 7 or 8 quarts at $19 each.

The moral of the story, don't hoarde oil for too long, especially at cold temps.

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Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gannet167] #5234774 10/09/19 10:38 AM
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The pictures of residue in those 2 bottles show what was combined out of 4 half empty bottles. The actual fallout in each individual bottle before combining would be a quarter to a half of what the pictures show.

Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gannet167] #5234775 10/09/19 10:39 AM
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One thing about the clear bottles, you can tell if there is separation for sure.


2002 Silverado 5.3 0w-20 AMSOIL
Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gannet167] #5234788 10/09/19 10:48 AM
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It's likely EP additives. I would have shaken it up and dumped it in. Amsoil intended it to be there, you should put it in.

Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gannet167] #5234793 10/09/19 10:53 AM
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I remember i purchased a few quarts of Redline D4, The fluid had a jelly like gel at the bottom of the container. It was a new purchase so i returned the fluid and they sent out a newer batch of the fluid, In my case the seller had the fluid it in my opinion to long.

Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gannet167] #5234800 10/09/19 10:57 AM
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Gannet167 Offline OP
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I wonder how hot I'd have to microwave it etc to get those crystals to dissolve again. Would that have been an option before starting the job? Shaking the bottles does nothing to mix this as it's a hardened crystal like residue.

Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gannet167] #5234801 10/09/19 11:03 AM
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Will an oil even heat up in a microwave?


1994 BMW 530i, 246K
1996 Honda Accord, 280K
1999 Toyota Sienna, 420K
2000 Toyota ECHO, 281K
Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gannet167] #5234812 10/09/19 11:22 AM
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MolaKule Offline
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Originally Posted by Gannet167
I wonder how hot I'd have to microwave it etc to get those crystals to dissolve again. Would that have been an option before starting the job? Shaking the bottles does nothing to mix this as it's a hardened crystal like residue.


Do not attempt to microwave.

Set it in the sunshine or over a hot air register for 15 minutes and shake.

No big deal.

Last edited by MolaKule; 10/09/19 11:23 AM.

"You ... sadist," said Mr Cummings, "you try to make people think." Ezra Pound (1885-1972)
Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gannet167] #5234842 10/09/19 11:58 AM
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What, no shaking first? no-no


I use the overseas manual to choose my viscosity.

Using AMSOIL

Hers: 2008 Jeep Liberty 154k, SS 5w30/Amsoil

His: 2015 4Runner 60k, SS 5w20/Amsoil

Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gannet167] #5234881 10/09/19 12:41 PM
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in my experience, shaking does next to nothing to help.


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Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gasbuggy] #5234883 10/09/19 12:43 PM
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Originally Posted by Gasbuggy
in my experience, shaking does next to nothing to help.

Well no it isn't going back into solution in the bottle. But it does help to get everything that's in the bottle into the gearbox (or the sump) and when it warms up then it should dissolve.


1994 BMW 530i, 246K
1996 Honda Accord, 280K
1999 Toyota Sienna, 420K
2000 Toyota ECHO, 281K
Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gannet167] #5234907 10/09/19 01:00 PM
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Audios Online Content
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What if you drain a cup or so out, mix in the bottle, shake it up and pump back in?


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1998 BMW M3/4/5 Fuchs 5/40
Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gannet167] #5234920 10/09/19 01:25 PM
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Originally Posted by Audios
What if you drain a cup or so out, mix in the bottle, shake it up and pump back in?

I like that answer...….really soothes the OCD in me! grin


2006 Jeep Commander 3.7 V6 -114k (PUP5W30/XG3600)
2006 Toyota Corolla 1.8 VVTi -84k (M1EPHM5W30/XG3600)
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Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Gannet167] #5234996 10/09/19 02:59 PM
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Those are old bottles. How old I don't know? Perhaps Mr. Pablo can help? Amsoil gear oil is Tier one.


N = R* x fp x ne x fl x fi x fc x L
Re: Additive Fallout / Separation Amsoil Gear Oil [Re: Onetor] #5235015 10/09/19 03:23 PM
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Originally Posted by Onetor
Those are old bottles. How old I don't know? Perhaps Mr. Pablo can help? Amsoil gear oil is Tier one.
I would agree--those are old bottles. From at least 2010 forward, the bottles have been black for 75W-90 Amsoil.


2019 o)|||||(o Rubicon Wrangler Unlimited 3.6L V6 [Castrol Edge 0W-20 + FRAM Ultra]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum Euro 0W-40 & Mann filter]
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