1991 Volvo 740 4 cyl Two Wheel Drive Automatic 176805 miles

May sound crazy...but what fluids are best?

Oil -- 20w50? Blend? Semi-Synthetic?
Fuel -- mid grade? Additives?
Transmission fluid?
Brake Fluid? Plain ol' DOT3?
Antifreeze? Orange or green? 50/50?

Any pro/con additives?

Thanks