Oil Detergents are wash-active substances in the oil, which prevent the formation of deposits or free the engine of them. If these are used up by exceeded oil change intervals, for example, the result is the increased formation of deposits (Oil Sludge). This causes friction to measurably increase in the engine, risking engine damage.
Oil Detergents are not always needed!!!
In some older vehicles especially those without Oil filters (vintage vehicles) using an oil with detergents can cause problems, these engines where built to allow the deposits to build up over time around the engine and moving these deposits around the engine could cause them damage, this is why we have for example the Fuchs Low detergent and Non detergent engine oils in the Fuchs Classic Range of engine oils.
The Fuchs Classic Engine oils range can be found here
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