Own a 2002 X5 3.0 diesel 5 speed (manual), take the plunge. The 2nd gear things you feel are likely the fact that the factory "lifetime" synthetic oil needs to be changed (use Redline MTL). Change the transfer case oil as well, if NV125 - either Redline ATF or MTL.
THEN replace the CDV valve. Been there, done that.
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