I wish my folks had given me a SLC ,but then it would have been a new car !
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Before you try to start this car,Buy 1,a new fuel filter,
Oil filter,
aircleaner element
spark plugs
and 5 liters of 50# oil.
Next clean the fuel tank out ,undo the bung under the tank if you can get it out,If you can't,drain the old fuel out via the larger hose that runs to pump.That old fuel will stink like you wont' believe[xx(]So don't get it on your skin,and don't smoke around it either.
with the fuel tank cleaned out and your new filter in place,put about 5 gals of juice in the tank,with about 250mls of trans fluid.The trans fluid is amazing stuff and will help get rid of gunk in the injection system.
remove the spark plugs.
Clean out the radiator water,there is a bung in the bottom of the radiator.undo that and let it all go.again ,it's noxious stuff .run a hose through the radiator to loosen any crud you may be able to see.
To do it better,I would remove the radiator and get a Radiator shop to clean it.
check all the hoses for hard ,or swollen or just plain tired hoses.
Refill it with plain water for the moment.
I'll bet the batterie is shot after 5 years so plan on buying a quality one ,with exact specs for the car.
Anthing less won't have the guts to run the injection pump and you will be down on performance.
It is always best to change the oil hot,but with your car,i would just drain what you can,but do not forget the oil coooler,it also has a drain bung,next to the radiator it has a hose in the top and one in the bottom.undo the bung and let all the oil go.Change the oil filter and the air filter.
do it back up and drain the sump.leave the bung out for a bout 15 minutes to ensure all the old oil is gone.Replace the bung,fill with oil and crank the starter until the oil pressure comes up.
Replace the plugs and plug wires and see if it will start.This where a new battery is important.Start the engine with radiator cap off.
Run it ,WITH NO REVVING, until it is hot.Check the water level while the engine is idling.water level should reach the ridge under the cap,check for big bubbles rising through the water,and once the idle has stabilised the water temp should be normal and NO bubles should be visible in the water.
This is where you can find the symptoms of overheating.
if it checks out OK,dump the plain water,run the hose threough the radiator again and refill with Mercedes anti corrosion and anti freeze.Check your oil level.Ask your parents if they ever had the timing chain changed,If the answer is No,get it changed as soon as possible.A broken chain will really stuff your day.[8D]