I change my oil every 2,500 to 3,000 miles, which gets to feel like every other minute sometimes. For those of you who do your own oil changes, I use a vacuum oil pump: Basically, you let the engine cool a bit and insert a nylon tube into the dip stick port. You then create a vacuum in a special 2 gallon oil canister fitted with a pump, to draw the oil from the engine into the canister. This device is better known to RV and boater fans.
Not certain where you'll find the best price, but so to show the unit I'm talking about, check out this link:
I recently bought the boaters version and tried it. It's a snap on the 300SE because the oil filter is accessable from the top but still a PITA on the Volvos I have because the filters are down low.
I do like the suction technique though.
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Near Manassas Va. '89 300SE, 2002 Ford Crown Victoria Police Interceptor, 89 420SEL
Had '65 220SE, 67 230S, 72 280SE 4.5 Dad had '65 300SE LWB, '65 220SE
"Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive." C.S. Lewis
BTW, if anyone wants one on the cheap, all you need is a shop vac, a 5 gal container, some pvc and some hose. Use the shop vac for suction through some pvc affixed to the container. Coming out of another pvc pipe on the container is the flexible tubing used to suction the oil. Make sure you drain the container every couple of changes or you'll have a big mess to clean up in the shop vac.