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Castrol Hypoy C 80w-90?

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Old 04-06-2013, 01:30 PM   #1
Mossy [OP] Mossy is offline
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Castrol Hypoy C 80w-90?

Anybody using it? I have a 97 sr5. Any opinions or suggestions of something better?
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Old 04-07-2013, 04:45 PM   #2
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Anyone?
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Old 04-15-2013, 02:23 PM   #3
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Bump
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Old 04-16-2013, 06:35 PM   #4
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azreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shed
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From what I have read on the web it sounds like an acceptable lube for differentials. The advertisements say it is intended for manual transmissions, also. However, it is a GL-5 lube. From previous research, I decided against using GL-5 gear oil in my manual transmissions. The sources I saw (sorry--no links. I did this research a year or so ago) said that the additives that make the GL-5 work well in differentials contain chemicals that are corrosive to copper and brass. The syncros in manual transmissions are brass.
YMMV. I have seen other brands of GL-5 gear lube with manual transmissions mentioned in the application notes, but I choose to not take any chances. I found a synthetic GL-4 lube that has worked well for me.
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Old 04-16-2013, 06:38 PM   #5
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FYI Toyota owner's manual specifies GL5 for manual transmissions for all years Tacos.

Can you even find GL4 easily in auto parts stores?
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Old 04-17-2013, 12:37 PM   #6
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azreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shedazreb is one of the sharper tools in the shed
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The manual for mine recommends GL-4 or GL-5. For the reasons I mentioned above I will stick with the GL-4. I found Redline MT90 GL-4 on the web.
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Old 04-17-2013, 04:53 PM   #7
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Amsoil Severe Gear 75w-90
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Old 04-17-2013, 04:59 PM   #8
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castrol makes some good lubes. I have used there engine oil for years I say go for it.
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