I re-booted my existing axles a few months ago with Flexx Boots, cost about $70 total. No leaks, no noise. Original axles still in perfect shape despite 283k on them. On my dad's SD, it had grinding original axles....so we swapped in a set from the junk yard (after re-booting them) from a 500SEL.....they have been great so far, and looked to be in excellent shape. The car they came from had 330k on it! 
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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