You need to switch out the wire harnesses to the engine.
If you are just doing an oil change then 3.3 quarts. If you are doing a complete overhaul where you are taking the engine covers off perhaps to change them or the gaskets then you need 3.8 quarts. This is directly out of the owners manual.
Need to know what engine it has.
3.5 qt
Need more info - which engine? 2.2/2.5? By 1989 no LeBaron had a carb.
The computer has detected a fault. You need to run a computer diagnostic to find out what's wrong.
When you change the oil on a 2003 GSXR 600, you need 3.0 quarts of oil if you do not change the oil filter. If you change the filter, you need 3.3 quarts of oil.
Need to no what size engine.
need to know which engine you have
If you find traces of oil in the antifreeze it's an indication of broken engine gasket. You need to go consult with a professional.
Unleaded fuel was introduced in the mid 1980s, it depends what engine it has, if it needs leaded fuel you will need a new engine
Changing the filter 3/5 gallons...