where to find GL4?

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I find Red Line MT-90 over the counter. Try a local speed shop, not your regular auto parts store. Or go to the dealer and buy the OEM stuff, if you don't mind bleeding.
 
I just checked out the Valvoline 75w-90, and it seems to be dual rated GL4/GL5.
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Seems like a lot of gear oils are that way now.
 
Yep, the GL4/5 dual rating is an attempt to reduce inventory.

However, many manf. still specify a GL4 MT lubricant.
 
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