Welcome to the forum!

The old gasket could work if it's in good condition. However, a new one is much more advisable. It shouldn't be too expensive.

Re starting the used engine, only common sense. Make sure oil and coolant have the right level, air filter is clean and tight, double check the torque for every bolt and give it ta try. Let us know how it goes.

Post a picture of your project!

 

Thank you so much, that is very helpful. I will try to post one soon.

 

It will depend on how well it comes off.

It may not just fall off, and may break or leave material on the pan.

If it's not expensive - just buy a new one.

 

I have reused oil drain washers on all my vehicles forever. Never an issue. Just tighten carefully with a short wrench by feel and without using a torque wrench. Copper crush washers can be renewed with a propane torch, a trick shown to me by an airplane mechanic.

 

Okay, nice thank you this exactly what I did. I dont believe it was made from copper. I really appreciate this information though.