As is usual for BITOG, you guys got me feeling compulsive so I went out and checked my capacitor. It is a dual-run type, 45 + 5, and it tests right on the money. I recently purchased a capacitance tester for another job. I have been spending some time in one of our HVAC parts stores as part of my continuing education. My take is that if you have an older system you should keep it going as long as possible. Yes, a new system uses less energy, perhaps substantially less. But, new systems have a lot of features to reduce energy usage that appear to be trouble spots. Add that to the fact that more parts have been sourced offshore to the lowest bidder in an effort to boost profit margins and the newer refrigerant (R-410A) is a blend of gases with its own set of issues.
This is what I have heard from the honest guys who are not just out to sell people new systems.
I clean my outdoor coil once a year with a hose and some cleaning solution. I cleaned the indoor coil several years ago and it was not at all dirty, but it may be due again. I had to cut a "hatch" into the transition to access the coil. If you use good filters and minimize infiltration around the filter frame your indoor coils stays pretty spotless.