diff --git a/src/main/kotlin/ru/otus/cars/Car.kt b/src/main/kotlin/ru/otus/cars/Car.kt
index 559978c..ac0af1a 100644
--- a/src/main/kotlin/ru/otus/cars/Car.kt
+++ b/src/main/kotlin/ru/otus/cars/Car.kt
@@ -28,4 +28,9 @@ interface Car : CarInput {
      * Внутренний статический класс - номерой знак
      */
     data class Plates(val number: String, val region: Int)
+
+    /**
+     * Горловина топливного бака
+     */
+    val tankMouth: TankMouth
 }
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/CarInput.kt b/src/main/kotlin/ru/otus/cars/CarInput.kt
index fc2478e..4fcd1dc 100644
--- a/src/main/kotlin/ru/otus/cars/CarInput.kt
+++ b/src/main/kotlin/ru/otus/cars/CarInput.kt
@@ -13,4 +13,9 @@ interface CarInput {
      * Руль влево на [degrees] градусов
      */
     fun wheelToLeft(degrees: Int)
+
+    /**
+     * Заправить бак топливом
+     */
+    fun refuel(liters: Int)
 }
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/CarOutput.kt b/src/main/kotlin/ru/otus/cars/CarOutput.kt
index 875339f..df0e50b 100644
--- a/src/main/kotlin/ru/otus/cars/CarOutput.kt
+++ b/src/main/kotlin/ru/otus/cars/CarOutput.kt
@@ -8,4 +8,9 @@ interface CarOutput {
      * Скажи текущую скорость
      */
     fun getCurrentSpeed(): Int
+
+    /**
+     * Показать уровень топлива
+     */
+    fun getFuelLevel(): Int
 }
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/Taz.kt b/src/main/kotlin/ru/otus/cars/Taz.kt
index 49df937..ed707f2 100644
--- a/src/main/kotlin/ru/otus/cars/Taz.kt
+++ b/src/main/kotlin/ru/otus/cars/Taz.kt
@@ -18,6 +18,13 @@ object Taz: Car {
     override val carOutput: CarOutput
         get() = throw NotImplementedError("Приборов нет")
 
+
+    /**
+     * Бензобак
+     */
+    override val tankMouth: TankMouth
+        get() = throw NotImplementedError("Бензобака нет")
+
     /**
      * Получить оборудование
      */
@@ -36,4 +43,12 @@ object Taz: Car {
     override fun wheelToLeft(degrees: Int) {
         throw NotImplementedError("Руля нет")
     }
+
+    override fun refuel(liters: Int) {
+        throw NotImplementedError("БА-БАХ!!!")
+    }
+
+    override fun toString(): String {
+        return "TAZ 666"
+    }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/Vaz2107.kt b/src/main/kotlin/ru/otus/cars/Vaz2107.kt
index be857d2..b3769c9 100644
--- a/src/main/kotlin/ru/otus/cars/Vaz2107.kt
+++ b/src/main/kotlin/ru/otus/cars/Vaz2107.kt
@@ -20,6 +20,8 @@ class Vaz2107 private constructor(color: String) : VazPlatform(color) {
         override fun build(plates: Car.Plates): Vaz2107 = Vaz2107("Зеленый").apply {
             this.engine = getRandomEngine()
             this.plates = plates
+            this.tankMouth = TankMouth.GasMouth()
+            this.fuelSystem = VazFuelSystem(tankMouth)
         }
 
         /**
@@ -57,9 +59,21 @@ class Vaz2107 private constructor(color: String) : VazPlatform(color) {
     override lateinit var plates: Car.Plates
         private set
 
+    // Переопределяем свойство родителя
+    override lateinit var tankMouth: TankMouth
+        private set
+
+    override lateinit var fuelSystem: VazFuelSystem
+        private set
+
+    override fun refuel(liters: Int) {
+        fuelSystem.refuel(liters)
+    }
+
     // Выводим состояние машины
     override fun toString(): String {
-        return "Vaz2107(plates=$plates, wheelAngle=$wheelAngle, currentSpeed=$currentSpeed)"
+        val fuelLevel = carOutput.getFuelLevel()
+        return "Vaz2107(plates=$plates, wheelAngle=$wheelAngle, currentSpeed=$currentSpeed, fuel=$fuelLevel liters)"
     }
 
     /**
@@ -74,5 +88,9 @@ class Vaz2107 private constructor(color: String) : VazPlatform(color) {
         override fun getCurrentSpeed(): Int {
             return this@Vaz2107.currentSpeed
         }
+
+        override fun getFuelLevel(): Int {
+            return fuelSystem.getFuelLevel()
+        }
     }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/Vaz2108.kt b/src/main/kotlin/ru/otus/cars/Vaz2108.kt
index 27b83b8..42ad85a 100644
--- a/src/main/kotlin/ru/otus/cars/Vaz2108.kt
+++ b/src/main/kotlin/ru/otus/cars/Vaz2108.kt
@@ -21,6 +21,8 @@ class Vaz2108 private constructor(color: String) : VazPlatform(color) {
         override fun build(plates: Car.Plates): Vaz2108 = Vaz2108("Красный").apply {
             this.engine = getRandomEngine()
             this.plates = plates
+            this.tankMouth = TankMouth.PetrolMouth()
+            this.fuelSystem = VazFuelSystem(tankMouth)
         }
 
         fun alignWheels(vaz2108: Vaz2108) {
@@ -61,9 +63,21 @@ class Vaz2108 private constructor(color: String) : VazPlatform(color) {
     override lateinit var plates: Car.Plates
         private set
 
+    // Переопределяем свойство родителя
+    override lateinit var tankMouth: TankMouth
+        private set
+
+    override lateinit var fuelSystem: VazFuelSystem
+        private set
+
+    override fun refuel(liters: Int) {
+        fuelSystem.refuel(liters)
+    }
+
     // Выводим состояние машины
     override fun toString(): String {
-        return "Vaz2108(plates=$plates, wheelAngle=$wheelAngle, currentSpeed=$currentSpeed)"
+        val fuelLevel = carOutput.getFuelLevel()
+        return "Vaz2108(plates=$plates, wheelAngle=$wheelAngle, currentSpeed=$currentSpeed, fuel=$fuelLevel liters)"
     }
 
     /**
@@ -78,5 +92,9 @@ class Vaz2108 private constructor(color: String) : VazPlatform(color) {
         override fun getCurrentSpeed(): Int {
             return this@Vaz2108.currentSpeed
         }
+
+        override fun getFuelLevel(): Int {
+            return fuelSystem.getFuelLevel()
+        }
     }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/VazPlatform.kt b/src/main/kotlin/ru/otus/cars/VazPlatform.kt
index 079c2da..6ca1603 100644
--- a/src/main/kotlin/ru/otus/cars/VazPlatform.kt
+++ b/src/main/kotlin/ru/otus/cars/VazPlatform.kt
@@ -14,6 +14,9 @@ abstract class VazPlatform(override val color: String) : Car {
 
     // Абстрактное свойство двигателя
     abstract val engine: VazEngine
+
+    // Абстрактное свойство типа топливной системы, определяемой горловиной бака
+    abstract val fuelSystem : VazFuelSystem
 }
 
 // Перечисление двигателей ВАЗ
@@ -23,4 +26,43 @@ sealed class VazEngine {
 
     data class LADA_2107(override val volume: Int) : VazEngine()
     data class SAMARA_2108(override val volume: Int) : VazEngine()
+}
+
+// Перечисление горловин бака
+sealed class TankMouth {
+    class PetrolMouth: TankMouth()
+    class GasMouth: TankMouth()
+}
+
+
+// Топливная система
+class VazFuelSystem(private val mouthType: TankMouth) {
+
+    private val tank = Tank()
+
+    fun refuel(liters: Int) {
+        when (mouthType) {
+            is TankMouth.PetrolMouth -> {
+                println("Залили $liters литров бензина")
+                tank.addFuel(liters)
+            }
+            is TankMouth.GasMouth -> {
+                println("Залили $liters литров газа")
+                tank.addFuel(liters)
+            }
+        }
+    }
+
+    fun getFuelLevel(): Int {
+        return tank.getFuelLevel()
+    }
+
+    private class Tank {
+        var currentFuelLevel: Int = 0
+        fun getFuelLevel(): Int = currentFuelLevel
+
+        fun addFuel(liters: Int) {
+            currentFuelLevel += liters
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/main.kt b/src/main/kotlin/ru/otus/cars/main.kt
index 978d0ef..79c6a77 100644
--- a/src/main/kotlin/ru/otus/cars/main.kt
+++ b/src/main/kotlin/ru/otus/cars/main.kt
@@ -16,6 +16,8 @@ fun main() {
     techChecks()
     println("\n===> Taz...")
     println(Taz.color)
+    println("\n===> Заправка")
+    AZS(20)
 }
 
 fun driveCars() {
@@ -90,4 +92,21 @@ fun repairEngine(car: VazPlatform) {
         is VazEngine.LADA_2107 -> println("Чистка карбюратора у двигателя объемом ${car.engine.volume} куб.см у машины $car")
         is VazEngine.SAMARA_2108 -> println("Угол зажигания у двигателя объемом ${car.engine.volume} куб.см у машины $car")
     }
+}
+
+fun AZS(liters: Int) {
+
+    val carsList = listOf(
+        Vaz2107.build(Car.Plates("123", 77)),
+        Vaz2108.build(Car.Plates("321", 78)),
+        Taz
+    )
+
+    carsList.forEach { car ->
+        println("Заправляем машину ${car.javaClass.simpleName}")
+        println(car.toString())
+        car.refuel(liters)
+        println(car.toString())
+        println("\n")
+    }
 }
\ No newline at end of file