Myth 10

The quicker the oil pressure light goes out again after changing the filter, the better the filter.

Wrong! Consider the facts:

Usually, there is only one reason why the oil pressure light comes on briefly and then goes out again: when, after changing, the filter is empty for a moment. But you can confidently leave the stopwatch where it is, because the time taken says nothing at all about filter

quality. The delay can be dangerous if the warning light no longer goes out – because

then the oil pressure is too low. Apart from a low oil level or a defective oil pump, the

problem may also be caused by the filter:

• the flow resistance is too high because an incorrect or low quality filter has been used

• the filter is full because the change interval has been exceeded.

With quality products from MANN-FILTER, you can be sure that your filter is not at fault if the oil pressure light comes on. Because they conform to OE specifications and therefore guarantee optimum function at all times. Also, quality filters from MANN-FILTER have an accurately functioning bypass valve, which is adapted to the engine and always opens and closes at the right time. Bypass valves used in cheap filters, however, are often badly made, or are even permanently open and therefore do not offer any comparable filtration performance. And unfortunately, no warning light will tell you that.