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Strongly manufactured manual gearboxes can take as much as 20,000 miles to break in properly. Aisin makes very good transmissions.
The first few shifts on a cold gearbox with less than 20,000 miles on it will be a bit crunchy unless you are careful to shift deliberately: depress the clutch, select neutral, pause briefly, select the next gear, release the clutch. That pause is essential. For downshifts on a cold gearbox double clutch and synchronize engine speed carefully. You should get no crunches.
After two or three shifts my nearly new gearbox shifts fine even when cold.
I think it is a big mistake to use any replacement gear oil until 20,000 miles have passed.
I also think it is dumb to use any transmission oil other than as specified by the transmission manufacturer. Gear oil suppliers don't know as much about the right oil for transmissions as the transmission manufacturer does.
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