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It's very interesting to see JCL would choose composite impeller over metal. I wouldn't skim on cooling components though. I put Hepu WP with metal impeller, Wahler thermostat.
With your mileage, if you choose not to overhaul the cooling system, but replace part when it breaks, you need to watch your temp gauge like a hawk every single day. M54 engine has no tolerance for being overhead with its aluminum head.
I choose to overhaul mine, for the piece-of-mind and not to be strained somewhere remotely in the middle of the night.
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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq
01 360 Novitec Spider F1 (26k miles)
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