Audi 80/90/Coupe

since 1986-1991 of release

Repair and car operation

Audi 80/90/Coupe
- 1.2. Car identification
   1. Maintenance instruction
   1.3. Arrangement of identification plates
   1.4. Dashboard
   - 1.5. Car service
      1.5.2. Seasonal change such as 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. AKPP liquid
      1.5.10. MKPP oil
      1.5.11. Air filter
      1.5.12. Spark plugs
      + 1.5.13. Hydraulic booster of a steering and amplifier of brake system
      + 1.5.14. Brake liquid
      + 1.5.15. Cooling system
      + 1.5.16. Tanks for washers of a windscreen and headlights of forward light
      1.5.17. Razbryzgivateli
      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 preventive car servicings / greasings
+ 2. Engines, carburetors
3. Greasing system
+ 4. Cooling system
+ 5. Fuel system
+ 6. Exhaust system
+ 7. Ignition system
+ 8. Transmission
+ 9. Suspension brackets, wheels
+ 10. Brake system
+ 11. Steering
+ 12. Body, salon
+ 13. Central air
+ 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 made by the various companies, differs on 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 in gasoline of the majority of brands to contain 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 the incorrect brand was used, the formed deposit can lead to decrease in performance data of the engine.

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

 – unstable operation of the engine in an idling mode;
 – fluctuations of frequency of rotation of a cranked shaft;
 – ignition admission;
 – capacity loss;
 – engine rotation after ignition switching off;
 – emergence of knock at 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 used fuel does not become covered by a guarantee.