For a DD, any high-quality lube will work and Redline will be overkill (a good kind of overkill; mainly a waste of money). Full synthetics tend to do better than petroleum-based or blends, but, for a DD, a syn-blend will do the job well. Pick any high-quality brand, change it often, and you should get many miles out of your drive train.
Many people on this site swear by Redline lubes and I don't remember seeing any problems being reported. I've never had need to use Redline but, if I ever have the need, that is the first brand I will try.
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