My car sounds horrible after an oil change?

I don't know what 'sounding like a wreck' sounds like.

You don't say whether the noise can be heard only while the engine is running, or when you are driving along.

Let me give some hints and tips here:

Cheap oil doesn't have any sound at all, same as expensive oil.

Even if they gypped you and didn't fill with any oil at all, the engine wouldn't make any noise in particular, and your oil warning light would come on.

Diagnostics won't necessarily find a noise. So don't make this a big deal.

You can do a lot yourself; open the hood (bonnet) and start the engine and go and listen to find the place where the noise is coming from. Please avoid any moving parts.

Get a friend, preferably one who knows a bit about cars, to listen with you and try to locate it. If you have to drive to hear the noise, ask your friend to listen out the window and try to find where it is coming from.

Just a wild suggestion; maybe the exhaust pipe has been damaged by them jacking up the car and this is now broken? Check it out.

Basically what I'm saying is; try to find out as much as you can about your problem before you go back to the mechanics place, so you can insist on them fixing it properly. Just throwing it back to them without knowing anything leaves them in charge of whatever they want to tell you.

If you know how or you need to get someone to check you oil level and just give your car a once over so you have back-up before you go back. I have seen people forget to put oil in car or forget the plug or double seal the oil filter which lead to a major leak. Just protect yourself cause their not out for you their out for them.

Your problem doesn't sound good, you have a good claim as to where your problem originated but keep in mind the shop that serviced your vehicle could deny any wrong doing on their part, they could claim that you may have been abusing your vehicle after you left their shop, such as hot rodden, leaving stop lights and stop signs like a jack rabbit, ect.ect. but it sounds like you have a good plan and I would do the same if it were me, stand your ground and hope its nothing real serious, good luck.

You won't get far. The engine is going to give out on you. The faster you run it the more likely it will throw a rod and leave you stranded. It's going to be expensive. I've seen them go right in front of me out on the highway and leave the passengers hitchhiking for home.

First thing you need to know is if there is oil in it, if you don't know how to check it yourself, find a friend that does. It sounds like they didn't put oil back in.

they may have left oilplug out if they did major problems walmarts is bad about that you better check your oil level fast hope not 2 late you need call ones who changed it asap