src/main/java/org/model/Car.java

@@ -59,6 +59,7 @@ public abstract class Car extends Vehicle implements Serviceable {
 
     @Override
     public boolean needsService(Vehicle v) {
+
         return v.getMileage() > 10000;
     }
 

src/main/java/org/model/ElectricCar.java

@@ -68,7 +68,7 @@ public class ElectricCar extends Car implements Chargeable {
 
     @Override
     public boolean needsService(Vehicle v) {
-        return super.needsService(v) || chargeLevel < 100;
+        return super.needsService(v);
     }
 
     @Override

src/main/java/org/model/GasCar.java

@@ -70,7 +70,7 @@ public class GasCar extends Car implements Refuelable {
 
     @Override
     public boolean needsService(Vehicle v) {
-        return v.getMileage() > 10000 || fuelLevel < 100;
+        return super.needsService(v);
     }
 
     @Override