I have redline in mine, but I also got a little 2nd gear syncro bite(bad in cold weather). It was suggested to me by a friend that I should try something other than the redline and the syncro might fix itself. I have yet to mess with it. Maybe this week.

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D