So im going to take my 1993 SC400 into the shop here soon to get a 90k tune up. What I was wandering is what else besides from my list below should i have done to it. Thanks!

New lower oil pan gasket (currently leaking)
Valve cover gaskets (currently leaking)
Fuel filter
Coils
Wires
Timing belt was replaced at 62k
Plugs were replaced at 62k

 

Both cap and rotors.

 

Is either of your cam seals leaking or your crank pulley seal? Maybe those, and possibly a radiator flush with new upper and lower hoses. What about your water pump or thermostat? I am sure these were done at the 62K mile marker, just a thought.