[tributeventures]

Interesting issue.
I recently had to remove my oil lines. A VERY knowledgeable Porsche mechanic told me the secret. Here it is:
Do not use heat or cut the nuts. Spray the nuts with "Blaster" , let sit and then tap the flat on the nuts with a hammer and punch. Spray again, let sit and then tap again. It may take a while (days) but eventually the nut will loosen and you can then remove the lines.