Help my sisters car recently shut off she said the oil light came on and it started to jerk then shut off. I have changed th oil and it drives great now, but now it makes a scrape noise what could it be?
The scrape noise sounds like plastic rubbing concret, but I know nothing rubbing the bottom of the ground.
It does not scrape when just in park runs fine in park only when I start driving afterwhile it starts making a scrape noise

check mud flaps...maybe it's loose and hitting tires or something
check all under-carriage plastics could be loose or not tite enough
check under the hood could be something hitting the timing belt
check exhaust pipes could be leaky or loose connection somewhere
check brakes

I am not sure but if it started after the whole engine thing it may be something inside the engine not being totally lubricated. Try putting in some engine restoration stuff and see if that takes care of it. But if it still persits then either get it looked at or if it is not causing any kind of problems that you can see then maybe just drive it for a while and see if it gets worse.