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Without seeing the car it’s hard to assess its condition, but as a rough guide I would put its vale at $4000 to $6500.
Mitsubishi doesn't provide a towing rating for the Mirage, so it's not recommended that you tow with it. If you do choose the tow with it you should check with your insurance company, as you might be in breach of the conditions of your policy.
Check the fuses and the connections to the fuse box.
The computer is getting a message that the engine is overheating. You have replaced the temperature sensor, so check the connections, and the wiring looking for a wire that might have shorted out.
The engine is most likely overheating, even though the gauge is at zero. Check the coolant level, and for leaks from the radiator or hoses. It could also be a blown head gasket. The bottom line is it needs investigation by a mechanic.
Somewhere in the region of $3000-$5000 depending on the condition.
You can use a 0W-40 A3/B4 or a 15W-40 dedicated diesel oil, and a Ryco filter. A local auto retailer should be able to help.
Check all the electrics to make sure everything is working, check for a service record, as turbos can be troublesome if servicing has been skipped, and timing chain wear can be an issue as high kays.
Oil is added through the cap on the rocker cover on top of the engine, fuel is added through the filler cap on the right rear quarter panel. If in doubt check the owner's manual.
It's hard to recommend a car that would suit you without knowing more about what you want to do with it, but I would suggest you avoid sporty models, low-profile tyres, and consider an SUV such as a Mitsubishi ASX, Nissan Qashqai, or Renault Captur.