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  #1  
Old 09-01-2017, 07:22 PM
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Default Gear Oil Question

We have recently moved to a new warehouse at work, with a new conveyor system...All new drive units are sealed, and don't require oil changes.

We have a partial drum of ISO220 synthetic gear oil, that I'm wondering if I can use in the transfer case, and differentials in my 40.

Looking for some input from some of you to see if it's a good idea or not.

Including a chart on different standardization grades showing ISO220 is equivalent to SAE90.

Your expertise is welcome.
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Old 09-02-2017, 06:50 AM
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From my reading of the chart I'd agree ISO 220 = SAE 90 viscosity. Whether it'll work, couldn't say. Maybe additives are different but for an FJ40 I'd think there'd be plenty of room for improvisation.
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Old 09-02-2017, 07:34 AM
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Sounds like nice oil....

In my experience, synthetics tend to leak from FJ40 gear cases, due to the seal design and age of the truck. I won't run them for that reason.

Steve
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Old 09-02-2017, 09:29 AM
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So thats a comparison of viscosities, which it looks equivalent. But, it also says 50w motor oil is same as 90wt gear oil and I wouldn't run 50wt engine oil in place of gear oil.

can you compare additive packages somehow? whats the oil? can we google it up and see?
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Old 09-02-2017, 02:56 PM
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What about the issue of not using synthetics in FJ-40 Trans/Xfer due to damage to the brass bushings? I recall something about this when I rebuilt mine.
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Old 09-02-2017, 03:05 PM
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Quote:
Originally Posted by ttubb View Post
What about the issue of not using synthetics in FJ-40 Trans/Xfer due to damage to the brass bushings? I recall something about this when I rebuilt mine.
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It's not synthetics, it's the API spec. Many gear lubes now are GL-5, which can be damaging to yellow metal parts. You want to only use GL-4 in your transmission due to the synchronizers. GL-5 is fine in transfer cases and diffs usually.

This explains it: http://www.widman.biz/uploads/Transaxle_oil.pdf

You have to differentiate gear lube specs from transmission lube specs, they aren't always the same. GL-5 meets all the API specifications for GL-4, so it's technically a suitable replacement. But that doesn't automatically mean it's the same in all characteristics.

Also this isn't always true, the manual transmission section in my Tacoma owner's manual lists either GL-4 or GL-5 as acceptable. Not sure what they changes to make this the case, I suspect different materials or coatings. I still use GL-4 MT90 in it, though.
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Old 09-02-2017, 04:03 PM
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Quote:
Originally Posted by rover67 View Post
So thats a comparison of viscosities, which it looks equivalent. But, it also says 50w motor oil is same as 90wt gear oil and I wouldn't run 50wt engine oil in place of gear oil.

can you compare additive packages somehow? whats the oil? can we google it up and see?


Not too much of info on the label, it's pretty worn. The oil is from Chevron
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Old 09-04-2017, 08:55 PM
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I ran 50% river water for about a year in an old '78 FJ40 I had as a teenager. No problems.
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Old 09-05-2017, 06:36 AM
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I ran 50% river water for about a year in an old '78 FJ40 I had as a teenager. No problems.

That's funny stuff there, Martin!
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