Engine lod after going from synthetic oil to Regular oil no knocking anything just sounds loud

2006 HONDA ACCORD
54,000 MILES • 4 CYL • 2WD • AUTOMATIC
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1975
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2006 Honda Accord bought new abt 54,000 miles
Always put in synthetic oil went to dearlship they did not put in synthic like I asked so last 2 oild changes it has had regular oil always heard you can never do that
now engine started running loud last few weeks do you think the oil has ruined the engine? Heat panal and exhust were checked fine.
Warranty almost up . Do you think Oil ruined Engine need to take it in.
Is there anything else should have them look for?

Engine usually is pretty quiet.
Also service adviser told me (with synthic alsways checked and told it can run down to 15 a indicated in car) Service adviser told me the same I dont think so I always had reg. oil and heard to chnage at 3,000 miles
Thank you for your time.
Aug 11, 2011 at 4:18 PM
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JACOBANDNICKOLAS
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Your engine shouldn't require synthetic. I agree with you that it is a better quality, but the chance shouldn't have caused the engine to fail. Have it checked to determine if it is an internal engine component first. Let me know what you find.
Sep 10, 2011 at 7:43 PM