diff --git a/src/main/kotlin/ru/otus/cars/Car.kt b/src/main/kotlin/ru/otus/cars/Car.kt
index 559978c..256519b 100644
--- a/src/main/kotlin/ru/otus/cars/Car.kt
+++ b/src/main/kotlin/ru/otus/cars/Car.kt
@@ -19,6 +19,11 @@ interface Car : CarInput {
      */
     val carOutput: CarOutput
 
+    /**
+     * Горловина
+     */
+    val tankMouth: TankMouth
+
     /**
      * Получить оборудование
      */
diff --git a/src/main/kotlin/ru/otus/cars/CarInput.kt b/src/main/kotlin/ru/otus/cars/CarInput.kt
index fc2478e..d595b08 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)
+
+    /**
+     * Заправиться
+     */
+    fun addFuel(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..d8713dc 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
+
+    /**
+     * Получить уровень топлива
+     */
+    fun getFuelLevel(): Int
 }
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/TankMouth.kt b/src/main/kotlin/ru/otus/cars/TankMouth.kt
new file mode 100644
index 0000000..6309418
--- /dev/null
+++ b/src/main/kotlin/ru/otus/cars/TankMouth.kt
@@ -0,0 +1,9 @@
+package ru.otus.cars
+
+/**
+ * Горловина
+ */
+sealed interface TankMouth {
+    class PetrolMouth : TankMouth
+    class LpgMouth : TankMouth
+}
\ No newline at end of file
diff --git a/src/main/kotlin/ru/otus/cars/TankSystem.kt b/src/main/kotlin/ru/otus/cars/TankSystem.kt
new file mode 100644
index 0000000..0bb9dac
--- /dev/null
+++ b/src/main/kotlin/ru/otus/cars/TankSystem.kt
@@ -0,0 +1,37 @@
+package ru.otus.cars
+
+/**
+ * Топливная система
+ */
+class TankSystem(private val mouthType: TankMouth) {
+
+    private val tank = Tank()
+
+    fun addFuel(liters: Int) {
+        when (mouthType) {
+            is TankMouth.PetrolMouth -> tank.addPetrolFuel(liters)
+            is TankMouth.LpgMouth -> tank.addLpgFuel(liters)
+        }
+    }
+
+    fun getFuelLevel(): Int {
+        return tank.getFuelLevel()
+    }
+
+    private class Tank {
+        var currentFuelLevel: Int = 0
+        fun getFuelLevel(): Int = currentFuelLevel
+
+        fun addPetrolFuel(liters: Int) {
+            println("Заправляемся бензином, $liters литров")
+            currentFuelLevel += liters
+        }
+
+        fun addLpgFuel(liters: Int) {
+            println("Заправляемся газом, $liters литров")
+            currentFuelLevel += liters
+        }
+    }
+}
+
+
diff --git a/src/main/kotlin/ru/otus/cars/Taz.kt b/src/main/kotlin/ru/otus/cars/Taz.kt
index 49df937..49b9bc8 100644
--- a/src/main/kotlin/ru/otus/cars/Taz.kt
+++ b/src/main/kotlin/ru/otus/cars/Taz.kt
@@ -1,6 +1,25 @@
 package ru.otus.cars
 
+import kotlin.random.Random
+
 object Taz: Car {
+
+    /**
+     * Рандомный выбор горловины
+     */
+    private fun getRandomTankMouth(): TankMouth {
+        return when (Random.nextInt(0, 2)) {
+            0 -> TankMouth.PetrolMouth()
+            else -> TankMouth.LpgMouth()
+        }
+    }
+
+    /**
+     * Горловина
+     */
+    override val tankMouth: TankMouth
+        get() = getRandomTankMouth()
+
     /**
      * Номерной знак
      */
@@ -36,4 +55,8 @@ object Taz: Car {
     override fun wheelToLeft(degrees: Int) {
         throw NotImplementedError("Руля нет")
     }
+
+    override fun addFuel(liters: Int) {
+        throw IllegalArgumentException("Топливная система не найдена! Взрыв!")
+    }
 }
\ 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..2e45707 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.LpgMouth()
+            this.tankSystem = TankSystem(tankMouth)
         }
 
         /**
@@ -40,6 +42,15 @@ class Vaz2107 private constructor(color: String) : VazPlatform(color) {
     override lateinit var engine: VazEngine
         private set
 
+    override lateinit var tankMouth: TankMouth
+        private set
+
+    override lateinit var tankSystem: TankSystem
+
+    override fun addFuel(liters: Int) {
+        tankSystem.addFuel(liters)
+    }
+
     /**
      * Семерка едет так
      */
@@ -74,5 +85,9 @@ class Vaz2107 private constructor(color: String) : VazPlatform(color) {
         override fun getCurrentSpeed(): Int {
             return this@Vaz2107.currentSpeed
         }
+
+        override fun getFuelLevel(): Int {
+            return tankSystem.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..d7a1296 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.tankSystem = TankSystem(tankMouth)
         }
 
         fun alignWheels(vaz2108: Vaz2108) {
@@ -38,6 +40,15 @@ class Vaz2108 private constructor(color: String) : VazPlatform(color) {
     override lateinit var engine: VazEngine
         private set
 
+    override lateinit var tankMouth: TankMouth
+        private set
+
+    override lateinit var tankSystem: TankSystem
+
+    override fun addFuel(liters: Int) {
+        tankSystem.addFuel(liters)
+    }
+
     /**
      * Восьмерка едет так
      */
@@ -78,5 +89,9 @@ class Vaz2108 private constructor(color: String) : VazPlatform(color) {
         override fun getCurrentSpeed(): Int {
             return this@Vaz2108.currentSpeed
         }
+
+        override fun getFuelLevel(): Int {
+            return tankSystem.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..b8299e0 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 топливной системы
+    abstract val tankSystem: TankSystem
 }
 
 // Перечисление двигателей ВАЗ
diff --git a/src/main/kotlin/ru/otus/cars/main.kt b/src/main/kotlin/ru/otus/cars/main.kt
index 978d0ef..fddb7d2 100644
--- a/src/main/kotlin/ru/otus/cars/main.kt
+++ b/src/main/kotlin/ru/otus/cars/main.kt
@@ -16,6 +16,9 @@ fun main() {
     techChecks()
     println("\n===> Taz...")
     println(Taz.color)
+
+    println("\n===> Заправка")
+    addFuel(20)
 }
 
 fun driveCars() {
@@ -90,4 +93,20 @@ 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 $car")
     }
+}
+
+fun addFuel(liters: Int) {
+
+    val carsList = listOf<Car>(
+        Vaz2107.build(Car.Plates("123", 77)),
+        Vaz2108.build(Car.Plates("321", 78)),
+        Taz
+    )
+
+    carsList.forEach { car ->
+        val output = car.carOutput
+        println("${car.javaClass.simpleName} - Уровень топлива до проверки: ${output.getFuelLevel()}")
+        car.addFuel(liters)
+        println("${car.javaClass.simpleName} - Уровень топлива после проверки: ${output.getFuelLevel()}")
+    }
 }
\ No newline at end of file