Spin-on oil filtres: Well lubricated


If one considers the tendencies in the original equipment sector it becomes clear: in addition to a trend towards increased type variety for replacement filters—due to new engine designs and restricted space in the engine compartment—a distinct increase in service intervals can be noticed. Filter service life spans of 30,000 km and more are now common for many new vehicles and some manufacturers are even quoting 50,000 km—driving patterns and the quality of engine oil taken into account. However, a longer service life does not necessarily mean less sales revenue. This is because the longer the replacement interval, the more important the quality of the oil filter.


Today in the series, tomorrow in the workshop: The cellulose-free filter medium
Increased service life makes also higher demands on the filter media in oil filters, particularly as the new engine generations with direct injection increase the problem of oil aging. With the use of new fully synthetic high performance oils, replacement intervals of up to 50,000 km are reached—with a trend to even longer intervals. However, due to the new general conditions, conventional filter raw materials are becoming less suitable, especially as the excessive nitration of the oils leads to embrittlement of the filter medial. The response from MAHLE: a fully synthetic two-layer fleece made of polyester, consisting of a support and a filtration layer. This makes it possible to achieve highest filtration performance with best stability—and at the same time block forming in the pleats can be avoided. Compared with cellulose fibres, the aging stability of the new oil filter medium is 7 times higher—and it offers the same or even lower pressure drop at significantly increased dirt pick-up capacity. The new cellulose free filter media are, for instance, available for Mercedes-Benz vehicles in the Aftermarket.


Tips from the filter expert
For the current requirement in service and repair, MAHLE offers with the two brands MAHLE Filter and Knecht a comprehensive well maintained filter range in uncompromising original equipment quality. However, not only the quality of the filter is essential. The quality of fitting and maintenance is as important. As simple as it may sound—also a high quality oil filter can only work properly when it has been fitted correctly beforehand. Therefore, we have some helpful tips for you—straight from the practice of the MAHLE filter experts.



Spin-on oil filter mix up? 
A spin-on oil filter consists of housing and filter element, which are inseparably connected and must therefore be changed as a unit. However, the problem is that many filters look identical but have completely different insides depending on the engine. For example, they may be with or without anti-drain valve or have different connection threads. They also can differ in the oil pressure of the bypass valve, filter media, the fineness of the filter or the permissible operational overpressure.




























Clever solution: The eco oil filter module
Many car manufacturers use Eco oil filter modules as original equipment in their vehicles. This up-to-date and eco-friendly solution consists of two parts: firstly the filter housing made from metal, which remains with the vehicle during its entire life time and can take on auxiliary function such as carrier for other units—and secondly, the filter element, which consists of paper and environment-friendly plastics that can be incinerated. The element is exchanged during regular service and incinerated in waste incinerators with heat gain. What remains is a small pile of ash. For this system, MAHLE has been awarded the first prize from the BDI (Confederation of German Industry) in 1996.


Fitting tips for oil filter cartridges
Self-draining: in order to direct the oil located in the filter cartridge into the oil pan (and not onto the workshop floor) a hole opens in the housing lid when the filter is unscrewed. This allows the oil in the housing to drain in direction oil pan. Non-contact: To make it unnecessary to touch the oily filter cartridge during dismantling, it is either clipped to the lid or is fixed to an internal support frame connected to the lid. Memory effect: before dismantling it is recommended to observe the fitting position of the filter in order to place the new cartridge accordingly. Clear the ring: before final assembly of the lid/filter unit, the old sealing ring must be replaced with the enclosed new ring. To place the sealing without damage into the intended groove, cover the lid thread with a sleeve or sticky tape and then slip over the sealing ring by hand. Safe fit: after positioning, check the exact fit of the sealing and then spread some engine oil over it. This will prevent twisting or damage of the sealing when the lid is screwed on. The right torque: first screw on the lid by hand and then use a torque wrench to tighten it. Details about the torque are cast-in on the lid or are available from the fitting instructions of the vehicle manufacturers.


Structure of a spin-on oil filter

Engine damage due to damaged sealing: as the damage acts similar to a predetermined breaking point, the sealing was torn at 45 degrees and partly squeezed out of the sealing groove when the filter was tightened. The result: immediate oil pressure loss—and subsequently engine damage.