Originally Posted by
jadocs
My R8070 Di2 must be an anomaly because it's never been noisy.
Same here. Both my DA Di2 and Ultegra Di2 run pretty silent. But then, I don't lube or wipe down my chain on a regular basis. I lube when I wash -- probably about every 1,000 miles. Nothing more is needed. (The chain lube / wax / hot oil enthusiasts are getting the vapors after reading that. Sorry.)
If my Di2 were noisy, I would suspect somebody messed with the rear derailleur adjustment.