this was the culprit




please refrain from adding stop leak to any system - no matter how strong the marketing or how convincing the sales person sounds.


this has damaged water pumps for me, choked up the expansion tank barb fitting and destroyed the radiator cap neck too.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)