Although I appreciate the possibility, I doubt sludge is the problem, this car has been very well taken care of most if not all of its life.
Then again, the labor isnt really a problem for me and the coolant level sensor/oil level sensor/oil pan gasket are only $69/$44/$39 from my local parts house, respectively . ($63.24/$81.25/$48.48 from my dealer)
If it bothers me enough, and no other suggestions arise, I may give replacing those parts a shot in a few months. I was hoping to replace all my vacuum lines, heater hoses, etc and do a complete tune up first.
1996 SSEi, tan leather, gold wheels...