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-   -   Castrol Hypoy C 80w-90? (http://www.tacomaworld.com/forum/technical-chat/271992-castrol-hypoy-c-80w-90-a.html)

Mossy 04-06-2013 01:30 PM

Castrol Hypoy C 80w-90?
Anybody using it? I have a 97 sr5. Any opinions or suggestions of something better?

Mossy 04-07-2013 04:45 PM


Mossy 04-15-2013 02:23 PM


azreb 04-16-2013 06:35 PM

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.

KenLyns 04-16-2013 06:38 PM

FYI Toyota owner's manual specifies GL5 for manual transmissions for all years Tacos.

Can you even find GL4 easily in auto parts stores?

azreb 04-17-2013 12:37 PM

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.

BUZZCUT 04-17-2013 04:53 PM

Amsoil Severe Gear 75w-90

Jetman1979 04-17-2013 04:59 PM

castrol makes some good lubes. I have used there engine oil for years I say go for it.

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