In the engine may appear significant deposits. Usually at the same time there is partial or complete loss of elasticity (up to failure) seals (gaskets, valve stem seals, etc.). In Unlike mineral oils, which are "washed" deposits in the engine slowly, layer by layer, synthetic oils (due to their inherent high strength and penetrative ability) causes detachment of deposits from domestic surfaces of the engine, which can lead to clogging of the mesh maslopriemnika, oil channels are working in oil starvation and, consequently, failure of the engine. Similarly, in the zone of gland seals (including those of the microcracks, if any) will remove all the deposits and, in case of loss of elasticity of the seals, synthetic oil, purified pre-yourself "way" would flow from the engine. Thus, the use of synthetic oils are not recommended in the following cases: - when there are significant deposits on the inner surfaces of the engine - if the sealing elements (gaskets, maslrsemnye caps, etc.) have lost elasticity and (or) have cracks (to replace oil seals) - seals in engines with "padding" (GAZ Gazelle, UAZ, old Renault) - possible leak (although at extremely low temperatures, when no other output is allowed to use "synthetic") - a running-in period for engines that require run-in, ie "Useful wear" in order to break-in of friction couples. The same applies to the engine after overhaul. In these cases, run-in must be made on quality mineral oil (eg BP Visco 2000), then you can switch to "synthetics".
- A rotary-piston engines. In all other cases, the use of synthetic oils are not only In no case will not harm even the "old" and worn engine, but rather guarantees for its protection and ensure the best possible life. How to switch to synthetic motor oil? If there is concern that transition to the "synthetics" are a problem, you should use the following guidelines: 1. First, assess the condition of the engine, ie, check for deposits and defective gland seals. If the engine there are already leaks oil, then switch to "synthetics" is impossible to eliminate the reasons causing them. 2. If the engine has significant deposits - "wash" the engine oil system.
3. If there is reason to believe that seals have lost elasticity (as, for example, states the following stains in the ground planting), the transition to the "synthetic" is better to defer to engine repair and replacement of seals. If signs of leaks do not occur then the reliability can be recommended at first to switch to semi-synthetic oil and drive it to the full range of replacement. If you still stains the ground at landing glands do not appear, it is possible switch to the use of fully synthetic products. Used in the text abbreviations are used: - ASEAN - Association of European car manufacturers - API -
American Petroleum Institute - SSMS - Committee car manufacturers to the Common Market (from 1.1.1996 was replaced by ACEA) - SAE - Society of Automotive Engineers
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