Why is my car making a loud clanking/ticking noise once I reach 40-45mph?

2003 MAZDA 6
18,000 MILES
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ADAMVORNHAGEN92
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I just had an oil change, noise started just after once getting on the highway.
Nov 29, 2011 at 9:27 PM
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BMRFIXIT
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engine off
check engine oil
check if engine oil leaked out
Nov 29, 2011 at 9:35 PM