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Probably the best (particularly in low temps) full synthetic GL-4 around is Castrol Syntorq LT, but due to marketing agreements through OEM's, it can be harder to find. We use it exclusively in Nissan 6 speeds requiring GL-4 lubes due to the alloys used in the double synchronizers on the first and second gears, works very well and holds up for a long time.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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