Mitsubishi Endeavor Owner's Manual page 399

Comfort controls
Causes of disturbances
FM reception is affected by the electrical systems of vehicles in
the vicinity, especially those without an electronic noise sup-
pression device. The disturbance is even greater if the station is
weak or poorly tuned.
FM reception is not as sensitive to electrical disturbances as
AM. AM reception is sensitive to electrical disturbances such
as power lines, lightning and other types of similar electrical
phenomena.
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