For things that require tools or expertise that I do not have, I use the Midas up the street. I had all my front belts, water pump, timing belt, and front seals replaced there. There was so much oil and blow-back under the car that they couldn't be 100% sure where the oil was leaking from. They put some UV dye in the oil to help with the diagnosis.

I degreased the underside myself and when I took it back, they told me they could see it mainly around the oil pan gasket. They think the timing belt cover might be leaking a little, but that's under warranty. Since the oil pan gasket sounds very troulesome, I'll probably just pay them to replace it for me. They do reasonably good work at a good price, and have no qualms about installing parts that I've purchased (e.g. tie rods).

I just want to be sure that it (or some other gasket) is not going to blow out in a few weeks due to excess pressure from a clogged up (other than the flame trap) system someplace.

I read a post regarding the oil breather box clogging up between 150 and 200K miles. Mine's at 180k, so I'm wondering if I need to check that part out.
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Volvo #6: all wagons.... 1972 145S, 1976 245 DL, 1983 245 GL, 1986 740 GLE, 1990 740 GL, now a 1995 940...