I need some help in understanding how to fix a problem (for oil change in car)

[Stargazer99]

created by a business that had changed my car oil. I usually use this business for oil changes, but one time I did not have the time to go there. I went to a Walmart store that did oil changes. I was told the way something was done in my last oil change that upon opening to drain the old oil, the way it was closed previously would damage my system if the drain was done normally.
Can someone explain how the oil drain was closed off so another business might damage my system if the oil change was done in a normal manner?
Maybe some mechanics will understand this, I do not, not even to the point of explaining this clearly.

[Major Nikon]

1. Sounds like they stripped the threads on the oil plug

[Chan790]

2. Knowing little about cars, I'm skeptical of what the Walmart tech is telling you.

Not because it's Walmart but because that just sounds off, the sort of thing someone would tell a client they think doesn't know better in order to upsell them a more-expensive procedure.

Minimally, I'd seek a third in-person opinion to determine if your regular guy damaged your system, the Walmart guy is trying to scam you, or what the facts of the matter are.

[Stargazer99]

4. No, the Walmart tech refused to do the oil change explaining the problem

[BlueJazz]

3. I'll parrot what Major Nikon said. Somebody cross-threaded the oil plug. Depending on the make ...

..of car and size of the oil pan hole, this is NOT a big deal to fix.

A decent repair shop can rethread the hole or if threads are too damaged, make the hole larger and rethread those.

I could do it in about 15 minutes. ....so don't let some shop make a big deal out of it.

[Stargazer99]

5. thank you for helping me to understand what might have happened

[Nac Mac Feegle]

6. Another possibility:

The "regular" place could have installed a semi-proprietary drain plug with a special fitting to make it easier for them.

I agree that they could have stripped or rounded the drain plug, also. Although a stripped drain plug usually leaks.

I'm a bit suspicious of the MallFart people on a general basis, though, as a matter of course.

Try to get back to the 'regular' place, tell them what the Wallyworld grease monkey said, and ask for an explanation. If they try to gobbledeygook you, get a trusted third party to look at it.

[BlueJazz]

7. Good point!

[Hotler]

8. I only let the dealership I purchased...

my truck from service it or an authorized dealer. I never take it to GreaseMonkey or any of them quick lube businesses.