HI, I just got a used 1993 300te with 117000 miles (red and sassy) I don't know all the history but due to some stalling (after changing the 02 sensor which seemed to have stoped the check engine light from going on) NO matter what I am going to change the 1) spark plugs and 2) spark plug wires (3 wire type/ any thoughts on how to determine or if it matters which type (the 90 bend end or the flexible end wires are corrrect?- I have no idea if the right ones are currenly in the car although from the records I have it appears that the car was services by a mercedes knowlegable repair shop since 90000 miles to the time I bought it at 117000 miles. I also intend to change the 3) gas filter and 4) air filter. (any trade offs with the Mann filter vs K&N) and finally and other maintences I should do just to know when it was done (The auto trans was just rebuilt so I don't think that changing its fluid is necessary) 5) Brake fluid? 6) Radiator fluid?, 7) Power Steering Fluid? IF so to any of these any mercedes specific types?, And lastly at this milage can I change to 8) fully synthetic Mobile 1 and if so what weight (I live in California near Salinas so I generally am dealing with pretty temperate temperature ranges). Also thanks to Arthur Dalton re suggestion to chack all the codes especially on pin 8 - am working on finalizing my handy dandy radio shack parts device today. That might reveal who knows what else since the car still has some stalling going on after the 02 sensor was changed.

What I've done is listed below. Not all work was 100% necessary, I just want to make it as like new as reasonably possible.

Work done immediately prior to purchase by seller:
A/C blower motor
oil sending unit
driver’s side door window motor
Climate control unit

Work done by me: (January, February & March of 2006)
Coolant reservoir
coolant reservoir cap
5 coolant hoses
thermostat & gasket
radiator overflow plug
coolant
Acc mono valve
auxiliary water pump
grommets for windshield washer tank pumps
fuel filter
oil and oil filter
power steering fluid flushed & filter
hydraulic fluid flushed & filter
transmission fluid, filter, & gasket
rear diff. fluid
wiper blades: front, back & headlights
distributor cap, rotor, suppressor & o-ring
ignition wire holder
6 spark plugs
voltage regulator
battery & battery hold down clamp
refinished battery tray
2 breather hoses
air intake hose
hood silencer pad
rear muffler & muffler clamp
4 exhaust system hangers
flushed brake system
flushed hydraulic suspension system
adjusted front bearings
rear shock bump stops & shock boots
2 accumulators
suspension Pull Rod
adjusted ride height
replaced trim piece by front seat

rubber covers that attach to driver's side & passenger mirrors
Acc. belt idler pulley
fan clutch bearing bracket
rear hatch stabilizer shocks-2 & new pins
re-glued MB tex in front side pockets
support joints on rear wheel carriers
valve stem seals
valve cover gasket
strut mounts
power steering hoses low pressure 2
hydropnematic suspension hose
air filter housing mounts
4 electrical connectors 0115457128
brake hose to calipers all 4
A/C system: receiver/dryer, pressure switch, temp. switch & 2.204 lbs of R134a
replaced all small vacuum hoses and rubber connectors in the engine compartment

Thing I’m going to do:
Install new a-arms with new bushings and ball joints
Install new front swaybar bushings
New tires and wheels

Ron, this is an impressive list. When do you sleep? Anyway that gives me a long term set of items. Any reponses/ preferences to the types of fluids I spoke about in my post? thanks Marc

I'm sure you can get lots of opinions on fluids. I use Mercedes hydraulic fluild for the hydropnematic system part #989910310, Febi/Bilstein fluid for power steering Part#08972 and for brake fluid either ATE TYPE 200 or ATE SL. The Tpye 200 has higher boiling points. For coolant I use only MB coolant.