Hmmm....are the 617 pumps more durable than the 603 pumps? There seem to be less reports of them failing, and many more people here have 617's than 603's.....not to mention the only ones I've heard of failing were on engines with like 400k+ on them....

5400rpm!? Wow.....Even to the floor between shifts my 617 never likes to go much over 4000-4200 or so....if I really push it I can get to 4500 in third before it wants to shift (unless I keep it from doing it with the shifter)....I'd never make my poor engine go much higher than that though, too paranoid. I am usually pretty gentle (and don't go much over 3500)

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'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)