Mine was still running, with a strong return flow in the overflow reservoir, when I had my RBs installed at 100k miles. I replaced it at that time as a preventative measure. The thermostat was on it's way out though; randomly failing open.
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RB Turbos w/ N20 TMAP Sensor | 93 Octane Protune by Cobb Plano | xHP Stage 3 | BMS DCI | STETT CP | Forge DVs | RB PCV | Helix FMIC | CP-E Catted DPs | Walbro 450 | Bilstein B12 | M3 Control Arms | Defiv Lockdown Kit | BBS CH | Michelin A/S 3+
Hixson BMW of Monroe, LA - Shady Dealer |
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