hate to clutter the forum but many people have asked and im not even sure myself so what oil should i use specifically for my car i bought it used i am the second owner it has 240000 miles and im not sure to use synthetic conventional or a mix. ive been told that if theres synthetic in the car and you switch to conventional you could damage the engine. im not sure of the truth to that but im in need of an oil change and dont know what to do
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