Overheating and loss of coolant is because you never got your coolant, hoses and/or thermostat changed. It's unlikely to have any relation at all for the oil. Stop driving and get it towed to a mechanic right away before your engine is completely toast. As in $1500-$2500 repair depending on how much you kept damaging it by continuing to drive it. And next time stop neglecting your car so horribly and get it properly maintained at regular intervals as recommended in the manual, to prevent these issues.

It more than likely that they over filled your engine with oil........turn off the engine and let the car sit for a while then check the dip stick.

You'll have to let out some oil if it reads above the full line on you dip stick. Like most substances, when the oil heats up it will expand and if the crankcase is filled above the recommended capacity the oil will find a way out of your engine the most serious damage is that it will blow a seal. If a seal is blown then the level on the dip stick might be below the level recommended and it will continue to leak until the damage is repaired. The over heating could be from lack of oil.....Check the front seal if there's oil all over the engine.

Did they forget to put the oil fill cap back on?

Don't go back there. Alot of those places will purposely damage your car so you'll be a repeat customer!

Thanks guys.my coolant has not been staying. I have been filling with water 3 times a day now since this I can find where the water is leaking from.

Check for a loose or stripped oil pan plug or loose filter.

Try going to a garage man.

About a month ago I got a oil change at pepboys. Now my car is over heating and my main concern is that I'm leaking oil not on the ground just all over the car. I have never had this problem before I went there. Any suggestions?