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Motul 300 was improvement in feel over OE oil (most oils i tried were improvement. in addition to OE, i had tried mentioned Motul, Synchrotech MTF, but Redline MTL subjectively seemed best). Good bit of Motul 300 is it conforming both GL4 & GL5 standards, as in it can be used also in our torsen diff.
Still, imho lockout misposition or slight clutch drag is more probable causes for hard to engage gears then oil. And why do you need whole new oil volume if it's just to inspect level and add or drain slight bit? Current oil isn't there for long mileage, just since synchro installment job? At most i'd inspect if there are no metal shavings in it.
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