The Oil Type is up to you Synthetic or Conventional.
As long as the Engine is Mechanically sound then I recommend Amsoil Synthetic Motor Oil.
2002 MITSUBISHI MIRAGE 1.5L & 1.8L 4-cyl Engine
FILTERS
Amsoil Oil Filter.........EAO13
Wix Oil Filter.........51356
CAPACITIES (1.5L 4-cyl Engine)
Engine, with filter..........3.5 quarts [1]
CAPACITIES (1.8L 4-cyl Engine)
Engine, with filter..........4.0 quarts [1]
[1] After refill check oil level.
7500 Miles or 6 Months = Wix Filter and XLF SAE 5W-30 Synthetic Motor Oil
25,000 Miles or 1 Year = Amsoil EA013 and SAE 5W-30 Synthetic Motor Oil
35,000 Miles or 1 Year = Amsoil EA013 and SAE 0W-30 Synthetic Signature Series Oil
Mechanically sound engines are in good working condition and do not, for example, leak oil or consume excessive amounts, are not worn out, do not overheat, do not leak anti-freeze and have properly working emission control systems.
If you want a Good Conventional motor Oil then I recommend Castrol GTX 5W-30 and a Quality Wix Oil Filter.
Hope This Helps.
The oil used in a 1999 Mitsubishi mirage is 5W-30. When engine the engine reach more than 150,000 miles switch to partial synthetic will help the life of the engine.
Purolator, Bosch, Wix, NAPA, & Carquest, are all quality filters you can use.
The 2001 Mitsubishi Mirage runs on regular unleaded.
The 2002 Mitsubishi Mirage runs on regular unleaded.
The 2014 Mitsubishi Mirage runs on regular unleaded.
Can you? Yes. Should you? NO! Use exactly what Mitsubishi recommends and that is not 15w40.
The 1995 Mitsubishi Mirage 1.5-liter MFI SOHC 4-cylinder engine uses R-134a refrigerant. The refrigerant capacity for this make and model is 28 ounces.
The clutch slave cylinder in your 1998 Mitsubishi does not use fluid. The clutch slave cylinder is sealed with grease inside of it.
Just use a good quality oil that is designed for diesel engines.
Mobil 1 5w-20
10W-40W best for magna's in Australia semi-synthetic
You can use 10W-30 weight motor oil in your Mitsubishi. A heavier motor oil can be used in extreme climates.