Are you troubled with Passenger Car engine oil leak

normally it is caused by degenerated / hardened seals or gaskets

Troubleshoot the followings:-

1) distributor,

2) camshaft 

3) crankshaft (on the pulley and the GB side),

4) crankcase (also known oil sump) and 

5) cylinder head

Notez:

Following is the spec for wira 1.5A year 2003

Engine model 4G15P
Displacement, cc 1468
Max.power (Net), kw(PS)/rpm 91 ps (66.93 kw) / 6000 rpm
Max.torque(Net), N*m(kg*m)/rpm 12.4 kg*m (121.60 N*m) / 3000 rpm
Power density 9.01
Engine type Serial 4 cylinder SOHC12 valve
Engine information MVV
Fuel system ECI multiple
Turbocharger No
Fuel type Unleaded regular gasoline
LEV system (Low emission vehicle) No
Compression ratio 9.4
Bore, mm 75.5
Stroke, mm 82
Fuel consumption at 10-15 modes, l/100km 4.7