Bought car used in summer 160k

Recently changed over to synthetic oil and afterwards developed a nasty oil leak.

Took the distributor cap off because I had misfires and noticed some oil in cap.

Had mechanic look for leak and it seems to be in the area of the cap.

Read that sometimes changing over to synthetic can cause leaks with a weak seal.

Also read that a clogged oil trap can cause the leak.

when it gets warm will change out the oil trap, done 4 on other volvo's so pretty proficient. Have not read of any fool proof method to tell if trap is clogged so might as well just change it. It was easier with the 740 with the rattle test on the oil cap.

Read post on changing the rear seal. Seems easy but learned that nothing is easy with a volvo.

Any wisdom on changing out the rear seal?

Madness