Better news:
Thanks for the posts everyone.
The oil leak at the pan was actually a power steering hose leaking from above (so much for an accurate $200 examination by the dealer's service department)
The oil sending unit p/l is only $160.
Upper control bushings are another $400.
Will leave evaporator alone. I have a 94 XJ12 with the same problem and they sprayed gook in it to hold for awhile.
Got Firestone to do a synthetic oil change, radiator flush, balance and alignment for $250.
So, things look good today.
I hate sitting on the edge of my seat waiting for something else to go, so like the Jag 12 I will just enjoy the beast as long as possible.
I have put my other cars on the block for sale to be able to afford my recent sin. Any takers?
300E, '90 Perfect condition, garaged always. 93K. White with blue int.
XJS, '95 Perfect condition six cylinder convert. 66K Ice blue with tan
XJ12, '94 Perfect 12 Van den Plas finish, 84K (evap. problem) mist green with tan interior.
420E, '97 Absolutely boss condition, flawless, 65K Dark blue/ blue
Would like to get black book Clean+ for each. Warranty
Will even part with my '98 740IL, white with tan, 30K!! Absolutely mint: $48,000.
Thanks all.