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I understand the motor mounts are designed to shear as a safety feature in the event of a collision.
I had a squeak under the hood that the dealer could not pinpoint for 2 years. Whenever I brought the car in for service they tried unsuccessfully to isolate. (Irritating squeak or rattle at idle - 2 liter diesel kind of rough idle to start with). Finally problem was identified as a broken motor mount. They only replaced one.
That’s when I researched and found the mounts are designed to break/shear for safety reasons and they actually fail quite often. I suspect due to bumpy roads - possibly extreme breaking? Lots of potholes here in boston.
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