E30 series BMW 3

since 1983-1994 of release

Repair and car operation

+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engine
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
- 14. Good advice
   14.2. Changed numbers
   14.3. Purchase of the old car or mysterious set of figures and letters
   14.4. Durability of the car
   14.5. About parallelism of bridges of the car and the trailer
   14.6. Preparation of the car for winter
   14.7. Rule 35
   14.8. Choice of the second-hand car
   14.9. Engine oils
   14.10. That it is necessary to know, changing oil
   14.11. Emergence in deposit oil
   14.12 whether. It is possible to mix import oils?
   14.13. "Eats" much, but silently goes
   14.14. It is rather live, than it is dead …
   14.15. It is not got - good advice
   14.16. Visit to car-care center
   14.17. A gear belt for a drive of the mechanism of a gazoraspredeleniye
   14.18. Wear of pistons
   14.19. Valves
   14.20. Bearings of engines
   14.21. Engine pollution
   14.22. As the conditioner works and what to do, if it failed
   14.23. Conditioner: not only "pluses", but also "minuses"
   14.24. Rules of service of the conditioner
   14.25. It is not necessary to stir antifreeze with antifreeze …
   14.26. That it is necessary to know upon purchase of the air filter
   14.27. Engine overheat
   14.28. That it is necessary to know to the owner of the car with the injector engine
   14.29. Accumulator
   14.30. Possible malfunctions of the storage battery
   14.31. What to do with the failed generator
   14.32. The belt is guilty, and we blame the generator
   14.33. Catalyst
   14.34. Rub in one - or how to save the catalyst
   14.35. Probuksovochka
   14.36. Features of operation of brake system
   14.37. Malfunctions of brake system
   14.38. Brake liquids
   14.39. ABS: natural choice
   14.40. Rims
   14.41. We update rims
   14.42. Scheme of marking of a car tire
   14.43. Metal corrosion
   14.44. Automake-up
   14.45. What creaks?
   14.46. Hatch
   14.47. Safety cushion: troubles or pleasures?
   14.48. We fit well?
   14.49. Anticreeping "immunodeficiency"
   14.50. Why headlights grow dull
   14.51. "Galogenki"
   14.52. About the correct adjustment of headlights
   14.53. Electric motor
   14.54. From change of places "composed" changes nothing?

14.12 whether. It is possible to mix import oils?


This and questions similar to it interest many motorists. The answer to the first – unfortunately, no, even if it oils of firms "with a world name" (Shell, Mobil, British Petroleum). Each firm makes commodity oils, adding to an oil basis the whole complex of the additives which chemical composition keeps in a big secret. Therefore, there are a lot of the qualitative oils of identical appointment made on requirements of rather ekpluatatsionno-technical properties of the international classification of API and the European specification SSMS-ASEA, but on technologies of various firms, when mixing are capable to create mixes of poor quality owing to interaction and a vzaimounichtozheniye of additives, that is "incompatibility" of additives. Oils of different firms are interchangeable, about possibility of use of such oils often specify Motorostroitel. But it does not mean that they can be mixed. Classification of API and the ASEA specification assume obligatory identical test methods (laboratory, bench – motor etc.) oils of different firms. At desire (or need) Motorostroitel can enter additional tests (or more severe constraints) to these classifications.

The same treats mixing of mineral or synthetic oils (sometimes – even one firm). Oils synthetic can have structure of hydrocarbonic character (in such cases of oil of one firm it is possible to mix, on what the firm the producer of oil and makes recommendations for what it bears responsibility), other chemical composition. Unfortunately, cases when when mixing oils their quality worsens are frequent. As a result of it can "begin to knock" the engine as the mix of incompatible oils turns into "jelly".

Even more negative answer to a question of possibility of mixing of import and domestic oils, especially what are made with an additive of "domestic" additives. Neither the seller, nor the consumer do not know structure of additives which are in oils. Some oils of "a domestic origin" are made by the "firms" which do not have even elementary knowledge of oil products. Sometimes such "experts" use the fulfilled oils (even without appropriate regeneration) to production of "commodity". Thus and corresponding quality. Therefore it is necessary to give councils in an occasion of possibility of mixing of oils very carefully!

No "cleaners" ("Tokron", etc.) are capable to increase gasoline octane number. For this purpose use special additives – anti-detonators which add in the course of gasoline manufacturing at petroplants, or additives. Deposits in the combustion chamber can be the detonation reason (metal knock in engine operating time is audible) and kalilny ignition (the engine continues to work at the switched-off ignition).

Compression increase in system "at introduction of some additives" occurs not at the expense of vyazkostny additives as they do not incorporate them, and for other reasons. But it already subject of separate conversation.

To reduce oil waste in the old engine and to raise a compression in cylinders at the expense of use of vysokovyazkostny oils it is inexpedient, поскольу it will lead at first really to compression increase in cylinders, but for a while. Further repair of the engine will cost dearer.

The reason of "acoustic noise" in the old engine is its wear. Therefore, repair with the subsequent use of high-quality oil will cheaper manage. It is possible to "reduce" gaps additives, but it is necessary to understand expediency of it not to do much harm to the engine.

Now apropos "ship oils" and possibility of their use in "road diesel engines". There are different oils. Special ship oils for diesel engines belong to group E, for example, M-16E30, M-16E60, M-20E60, intended for the low-turnaround diesel engines working at high-sulfuric vysokovyazkostny fuel – fuel oil. These oils have technical and operational properties (quality indicators), qualities of oils of "road" diesel engines different from indicators therefore their use in automobile diesel engines is impossible. There are ship oils of group D, for example, M-10dtsl20, M-14dtsl20, M-14dtsl30 which are used in the diesel engines working at high-sulfuric fuel. Oils waterproof, but have the raised alkaline number and a high ash-content. For "road", that is automobile diesel engines it is the increased wear of the engine which can not pay off over time free oil. M-16DR oil for ship diesel engines which work at distillyatny fuel – diesel fuel with the increased viscosity compared with viscosity "automobile" and the content of sulfur to 0,5 %, can be used in "road" diesel engines in the summer (for "heavy" cargo, instead of cars).

It is necessary to take for a rule: to use high-quality oil of one brand corresponding to the engine (on classification) and not to risk to mix it with same synthetic (or semi-synthetic) oil. The engine will thank for it reliable work. Do not buy oil privately as packing is easy for forging.