The answer to the first one is, unfortunately, no, even if these are oils from companies with a "world-famous" name (Shell, Mobil, British Petroleum). Each company produces commercial oils, adding a whole range of additives to the oil base, the chemical composition of which is kept a closely guarded secret. Therefore, many high-quality oils of the same purpose, manufactured according to the requirements regarding the operational and technical properties of the international API classification and the European CCMS-ACEA specification, but according to the technologies of different companies, when mixed, are capable of creating low-quality mixtures due to the interaction and mutual destruction of additives, i.e., incompatibility of additives. Oils from different companies are interchangeable, the possibility of using such oils is often indicated by engine builders. But this does not mean that they can be mixed. The API classification and the ACEA specification imply mandatory identical testing methods (laboratory, bench-motor, etc.) oils from different companies. If desired (or necessity) engine makers may introduce additional tests (or more stringent conditions) to these classifications.
The same applies to mixing mineral or synthetic oils (sometimes even from the same company). Synthetic oils can have a hydrocarbon composition (in such cases, oils from the same company can be mixed, which is what the oil manufacturer recommends and for which it is responsible), different chemical composition. Unfortunately, it is not uncommon for oils to deteriorate in quality when mixed. As a result, the engine may "knock" because the mixture of incompatible oils turns into "jelly".
An even more negative answer to the question about the possibility of mixing imported and domestic oils, especially those made with the addition of "domestic" additives. Neither the seller nor the consumer knows the composition of the additives that are in the oils. Some oils of "domestic origin" are produced by "companies" that do not have even basic knowledge of petroleum products. Sometimes such "specialists" use waste oils (even without proper regeneration) to the production of "commercial" ones. At the same time, the quality is appropriate. Therefore, advice on the possibility of mixing oils should be given very carefully!
No "cleaners" ("Tokron" and others) are able to increase the octane number of gasoline. For this purpose, special additives are used - antiknock agents, which are added during the production of gasoline at oil refineries, or additives. The cause of detonation (a metallic knock is heard while the engine is running) and glow plug ignition (the engine continues to run when the ignition is off) there may be carbon deposits in the combustion chamber.
The increase in compression in the system "with the introduction of certain additives" occurs not due to viscosity additives, since they do not have them in their composition, but for other reasons.
It is not advisable to reduce oil consumption in an old engine and increase compression in the cylinders by using high-viscosity oils, since this will initially lead to an increase in compression in the cylinders, but not for long. In the future, engine repairs will cost more.
The reason for acoustic noise in an old engine is its wear. Therefore, it will be cheaper to repair with subsequent use of high-quality oil. It is possible to "reduce" the gaps with additives, but the expediency of this should be understood in order not to harm the engine.
Briefly about "marine oils" and the possibility of their use in "automobile diesel engines". There are different oils. Special marine oils for diesel engines belong to group E, for example, M-16E30, M-16E60, M-20E60, intended for low-speed diesel engines running on high-sulfur high-viscosity fuel - fuel oil. These oils have technical and operational properties (quality indicators), differing from the quality indicators of automotive diesel oils, so their use in automotive diesel engines is impossible.
There are marine oils of group D, for example, M-10DCL20, M-14DCL20, M-14DCL30, which are used in diesel engines running on high-sulfur fuel. The oils are water-resistant, but have an increased alkaline number and high ash content. For automobile diesel engines, this means increased engine wear, which over time may not be compensated for by free oil.
Oil M-16DR for marine diesel engines that operate on distillate fuel - diesel fuel with increased viscosity compared to the viscosity of automobile fuel and a sulfur content of up to 0.5% - can be used in automobile diesel engines in the summer (for heavy trucks, not passenger cars).
It is necessary to make it a rule to use high-quality oil of the same brand that is appropriate for the engine (by classification) and don't risk mixing it with the same synthetic (or semi-synthetic) oil. The engine will thank you for this with reliable operation. Do not buy oil from hands, as the packaging is easy to counterfeit.
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