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How could i know if my 2008 dodge charger is leaking or burning oil? on 2008 Dodge Charger

my 2008 dodge charger is loosing oil,when i do the oil change it loses approximately 1 quarter every single week.The engine is not emitting any smoke or making any noise . Also, i check for any possible leak, but i did not find any oil residues at all.I take my car to the dealer and the mechanics said they couldn't find the causes of the oil loss ?

what eng and how many miles on car
51800 miles on car and the engine is V6 3.5L rear traction
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1 more answer , 4 more comments
What engine and how many miles on it? how many miles do you drive a week?
it is a 3.5l V6.it has 51745 miles and i drive like 280 miles per week.
If I read your original post correctly , then you are losing a Quart of oil for about 300 miles of driving.That is a lot of oil for the converter to burn off without seeing any smoke! I don't know how you visually checked for leaks , but you may have one that only leaks under higher pressure (RPM) and also is in an area that blow-back wouldn't be that obvious.Get recommendations for a good independent shop that can do an oil change with dye added (to check for leaks after driven).And also have it scanned (live data not just for codes/pending codes)and watch the fuel trim and O2 sensors for converter function.I've only seen one engine burning almost that much oil(1/2 quart every 800-1000 miles)and that was due to a cracked valve seat (honda element '05 15K miles)I guess dodge warranty is 3/36K not 5/60K and that you don't have any warranty recoarse?from a different angle do you know what oil is used at regular oil change ..brand/viscosity? I've seen a couple of things on other sites mentioning the type of oil making a difference.
thank you so much for your very well explained advise...i really appreciate it. Do you know any good shop where i can take my car? i live down here in Miami Florida
I wish I did. West Va. is a long way from Miami! Best suggestion I can give is to ask , ask and ask friends for references of shops they've been to and when you here a name more than two times and they don't have to advertise a whole lot to get business I think I'd go with that. Good luck! Thanks for the feedback !