Interesting, I bought a set from auto-zone of the triple square sockets, and used the one that fit the head bolts on the 617 motor....I was able to loosen them all with my 18" half drive breaker bar without a problem...they were very tight, but all came loose with some power from the arm guns.   No broken tools....the set was only $12 for 3 different sizes.
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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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