I had an 150 years ago and it leaked also. I think the case housing create the oil and fuel tanks internally if I remember correctly I think the XL models had seperate plastic tanks thus reducing the leaking problem between the two tanks, but some still leaked bar oil out?.

I would be happpy it just ran and oiled the bar and just drain the oil out after use, getting oil is alot better than not getting oil to the bar. You might try to loosen the oil cap and relieve any sifoning pressure off the tank. I had very few old saws that didn't leak the bar oil out after use when in storage, I just drained the oil back into the bar oil bottle.

i thank you for this info ill just drain the oil after each use instead of fixing it.thats whats good about gardenweb