A.Z. Meisterteile also offers excellent solutions in the field of filtration technology, thanks to state-of-the-art production processes and constant, rigorous testing. For filters, quality is an absolute must. In the long term, it is always worth choosing a premium quality filter, as this is the basis for a long service life and reliable operation.

Oil filters

Modern internal combustion engines offer excellent performance, but require first-class lubrication for smooth operation. As engine performance increases and service intervals become longer, it is not only engine oils that have to meet increasingly stringent requirements - the quality of the oil filters used is crucial to avoid damage caused by dirt particles, soot or unburnt fuel in the oil. The quality of the oil filter therefore contributes significantly to the performance and lifetime of the overall system.

When a filter is doing its job properly, internal engine components such as crankshafts, camshafts and valves are protected from contaminants that can cause severe wear or even serious failure. These parts are extremely expensive, so choosing the right engine oil and a quality filter to match can significantly extend the life of your engine, reducing maintenance costs.

A.Z. Meisterteile oil filters effectively clean the oil circuit of contaminants while offering a durable, reliable and service-friendly solution. They are designed to provide optimal filtration and continuous oil flow even under extreme loads, supporting maximum engine performance and reliability.

Typically, two types of oil filters are used. The first is the spin-on filter, which is a complete unit with a metal housing for quick and easy replacement, and the second is the cartridge oil filter, where only the filter cartridge needs to be replaced while the housing remains on the engine. The latter is more environmentally friendly and often allows visual inspection of contamination. Manufacturers use different solutions for different engines, but whatever the type, choosing the right filter is key to long-term engine protection.

Screw-on filters

Spin-on oil filters are still the most common type of oil filter used in vehicle engines. These were previously popular mainly because of their durability and easy, quick replacement. However, in modern engines, priorities have shifted towards smaller space requirements, environmental concerns and finer controllability, and spin-on filters are increasingly being replaced by cartridge systems. Nevertheless, they remain widely used and it is important to note that despite their apparently similar appearance, their internal design can differ significantly.

The valves inside filters play a key role in their operation, as they determine how the filter behaves under different operating conditions. Screw-on oil filters usually contain three types of valves:

• the by-pass valve allows oil to flow if the filter cartridge becomes clogged, thus preventing oil starvation,
• a by-pass valve prevents oil from flowing back into the sump when the engine is stopped, so that pressure builds up more quickly on start-up,
• the siphon valve helps to retain oil in the filter so that lubrication can start immediately on start-up.

The operating parameters and construction characteristics of this filter group must be chosen with great care, as they have a direct impact on the smooth functioning of the engine oil system. It is not enough to choose on the basis of size, thread or shape alone - the type of filter media and the opening pressure and characteristics of the valves also have a significant influence on how the filter performs in the engine.

Using a filter that does not meet the factory specifications can not only reduce filtration efficiency, but can also cause serious damage to the lubrication system - such as reduced oil pressure, insufficient lubrication or increased wear. It is therefore of the utmost importance to always use an oil filter that has been specified, tested and approved for the vehicle and engine in question.

Filter cartridges

Modern oil filter cartridges are typically installed in a sealed filter housing integral with the engine. Valves to ensure the proper functioning of the filter, such as backflow prevention or by-pass valves, as well as elements to precisely fit and secure the filter cartridge in place, are usually already housed in the filter housing itself. This design not only results in more reliable operation but also simplifies maintenance.

Modern filter cartridges are made without the use of metal parts, which has several advantages. The filter frame and cover are made of advanced, high-temperature resistant plastic, which provides excellent resistance to operational stress while significantly reducing the weight of the filter. Disposing of filter cartridges, which in particular do not contain metal parts, is much more environmentally friendly than recycling spin-on filters, which contain a combination of metal and rubber parts.

The use of materials in filter housings designed for engines currently in production has also evolved significantly over the years, with the former all-metal housing design gradually being replaced by lightweight, high-strength composite or plastic solutions. At the same time, the basic technical functions and design principles of oil filter housings have not changed: their purpose remains to securely hold the filter cartridge, ensure sealing and maintain proper oil flow and pressure conditions.

Fuel filters

Modern fuel injection systems require an extremely clean, homogeneous and free-flowing fuel supply. However, during the pressure generation and delivery process, various impurities can enter the fuel and need to be filtered out. The fuel system must be protected from the smallest impurities and corrosion damage. This protects the engine and ensures efficient vehicle operation.

The fuel filter filters out contaminants in the fuel, such as rust, metal shavings, dust and other solid particles. The consequences of inadequate fuel filtration can include a significant reduction in engine performance, disruption or interruption of fuel supply, premature damage to fuel system components, etc.

In general, fuel filters can be of various designs: screw-in (as in oil filters), plug-in tubular stand-alone filters (these filters are of metal or plastic housing design with connectors to the corresponding fuel lines), filter cartridges (these are environmentally friendly filter elements that need to be replaced without the housing, thus generating less waste), in-line filters (fit directly into the fuel line) and possibly pre-filters (typically used in diesel systems).

A.Z. Meisterteile offers a wide range of fuel filters for vehicles with advanced injection systems. These filters meet the most stringent requirements thanks to advanced design and manufacturing technology and continuous quality control.