Flushed the cooling system and took care of a couple of slow leaks. One leak was from the o-ring on the temp sensor on the lower radiator hose (replaced o-ring) and the other was form the o-ring on the temp sensor of the t-stat housing (replace t-stat/housing). I refilled with distilled water and a bottle of Prestone radiator flush and then drove it for a day. Today I flushed three times with distilled water then finally refilled with 50/50 mix antifreeze/distilled. Drained from the radiator and engine block each time (that block drain plug is a real PITA to get at).

After the cooling system I did an oil/filter change (Mobil 1 - synthetic, european formula) and, finally, drained out the summertime windshield washer fluid and refilled with some Windex De-Icer Windshield Washer Fluid. Bring on the winter.

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2001 e53 X5 3.0i (10/2000 build date) - Beige exterior, Beige/Sand interior w/ light wood