Just recently bought a 1988 subaru dl 4x4. It leaks oil from the oil pan due to a stripped bolt. Is there an easy way I can fix it without buying a new oil pan?

Look into getting a heli coil to put in place of the threads that are stripped out.

 

There are some other options out there, I recommend this one cause I have used it.

Depends on where the bolt is.   It could be in inaccessible due to crossmember.

  I have a replacement oil pan if you need one.    If you want a freshly resealed motor, I have that also.