2002 Mustang: Noise from the front when turning wheel

Ok so I thought I needed a little grease but knew that mostly they are sealed and dont need grease

Buddy mechanic says that yes they need lube but they are sealed

OK, so what is that??? Now we dont grease we replace I guess

What he did is drilled a hole into the joint and injected some grease and told me that he will replace it when we both have more time.

So far I have been driving on it for two months without a sound lol

That is info worth passing on and why I am doing it