What wt of GL-5 do I need for my Lexis 6MT?

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You sure it specs a GL5 lube? Amsoil is saying GL4 75W90 for the W55 6 speed. GL5 lubes typically suck in manual transmissions.
 
Awesome car BTW. Me? I would use Redline 75W90 NS GL-5 Gear Oil. Why? Redline states it helps to slow synchros for easier shifting across a broad temperature range. That is exactly what you want in a manual transmission. Redline doesn't cheap out on the base oil in their products.
 
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