E30 series BMW 3

since 1983-1994 of release

Repair and car operation

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.