Audi 80/90/Coupe

since 1986-1991 release

Repair and operation of the car

Audi 80/90/Coupe
- 1.2. Identification of the car
   1. Maintenance instruction
   1.3. Arrangement of identification plates
   1.4. Dashboard
   - 1.5. Service of the car
      1.5.2. Seasonal change like fuel
      1.5.3. Petrol additives
      1.5.4. The latest news in the field of fuel
      1.5.5. Cowl
      1.5.6. Engine compartment
      + 1.5.7. Engine oil
      1.5.8. Oil filter of the engine
      + 1.5.9. Automatic transmission liquid
      1.5.10. MKPP oil
      1.5.11. Air filter
      1.5.12. Spark plugs
      + 1.5.13. Hydraulic booster of steering and amplifier of the brake system
      + 1.5.14. Brake fluid
      + 1.5.15. Cooling system
      + 1.5.16. Tanks for washers of a windshield and headlights of forward light
      1.5.17. Sprayers
      1.5.18. Brushes of screen wipers
      + 1.5.19. Tires / wheels
   + 1.6. Independent service of the car
   + 1.7. Specifications
   1.8. Capacities
   1.9. Sizes
   1.10. Loadings
   1.11. Schedule of preventive servicing / lubricant of the car
+ 2. Engines, carburetors
3. Lubrication system
+ 4. Cooling system
+ 5. Fuel system
+ 6. Exhaust system
+ 7. System of ignition
+ 8. Transmission
+ 9. Suspension brackets, wheels
+ 10. Brake system
+ 11. Steering
+ 12. Body, salon
+ 13. Air conditioning system
+ 14. Electric equipment

1.5.3. Petrol additives


Big problem for a large number of producers of cars is formation of a deposit which appears because of use of the wrong type of fuel.

Though the gasoline produced by various companies differs in many parameters, it has one general property. Gasoline of any type contains substances which can lead to formation of a deposit on injectors and inlet valves. Though to contain in gasoline of the majority of brands the additives interfering a contamination of the engine and fuel system not all of them are equally effective.

After the long period during which fuel of incorrect brand was used the formed deposit can lead to decrease in performance data of the engine.

And deposits of a deposit, similar to those that are shown on an illustration can lead to other problems in operation of the engine:

 – unstable operation of the engine in the idling mode;
 – fluctuations of frequency of rotation of a bent shaft;
 – admission of ignition;
 – loss of power;
 – rotation of the engine after switching off of ignition;
 – emergence of knock during the operation of the engine.

If these phenomena proceed during the long period of time, it can lead to an engine exit out of operation.

Damage of the engine or its exit out of operation in view of bad quality of the used fuel does not become covered by a guarantee.