cyclist/gearhead/cycli...
Join Date: Oct 2004
Location: DC / Maryland suburbs
Posts: 4,166
Bikes: Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
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It's a *good* idea. In general, it's a good idea to put grease or anti-seize compound *anywhere* that steel and aluminum will be pressed up against each other. This prevents corrosion that can cause a stuck seatpost or stem.
I use white lithium grease with good results, and others prefer marine wheel bearing grease.