Thread: Thermostat Soft-Failed at 85k - Do I need to replace other parts?
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Old 12-11-2021, 04:37 PM
cn90 cn90 is offline
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For M54 engine, the 2 plastic hard pipes are good until 20y/200K or so, as long as you don't touch them. They don't burst but rather leak a bit here and there, if it happens.

The tstat failure is a good wakeup call.
I posted a DIY "Partial Cooling Overhaul" if you have around 100K-130K or so...
It is in this forum.
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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT
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