![]() A 10w 40 oil will gradually loose some of its viscosity and become 10w35-10w30 and so on. This is due to the contamination processes (Bi- products from cobustion) in the engine diluting the oil. The oils properties will eventually break down, and if left for too long they will start to burn. getting as much as possible trapped in the filter. The primary functions of a oil are to Lubricate, Displace heat, And to wash wear particles into the sump. The lubrication properties of fully synthetic oils can be far superior to that of semi or mineral oils.Some people think that by spending out the extra on these expensive oils that they will last longer. This is the main reason for not using a fully synthetic oil in an old engine. From parts such as piston rings with a high degree of hardness to valves cams turbo internals etc. These carbon deposits are extremly hard and will cause a lot of abrasive wear to the engine. A fully synthetic oil will loosen carbon deposits in the engine. Then by putting in a fully synthetic oil you can do more damage than good. If the engine that you are using has had a semi synthetic oil through out its life. Surely 10w 40 would be better for higher engine temperatures? ![]() I have raised this dispute on the gtturbo website and again there is mixed views.Īre you suggesting I change too 10w 30 as that is what they used in Japan.ĭoesn't the different cliamate affect this? So are we talking semi or fully synthetic. ![]()
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