i have lincoln MKZ 2008 , 53000 miles, i just bought it 3 weeks ago , it was very nice ( engine and transmission) but today i heard the engine make higher siund (it's not wired) but it's higher than before, so I am guessing it happened cause i used it in local area with slow speed cause i used it for food delivery , may be i need to use it in highway or there's something wrong other than that?
Check your power steering fluid,and you belts.
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