MAHLE has long been manufacturing high-quality oil filters for many large automobile and engine manufacturers—and of course the same machines produce identical filters for the aftermarket. This high level of quality has clear advantages: it ensures reliable function, good engine protection, and satisfied customers. The diversity of types is constantly increasing, however, as new engine architectures allow less and less space in the engine bay. Areas of application range from petrol and diesel engines for passenger cars and commercial vehicles to motorcycles and small engines. Because optimal lubrication of the bearings is extremely critical in all of these engines, all vehicle manufacturers require that oil filters be changed regularly.

A failure can make itself noticeable as follows:

• Filter medium has come loose from the end plate
• Filter is clogged
• Filter paper is torn

Causes for a defect could be:

• Oil change interval exceeded
• Filter not replaced during oil change
• Engine oil overheated (tuning, cooling system malfunction, etc.)

Fuel filters in original equipment quality from MAHLE pay off in every way: in the short term with fair margins, and in the long term with satisfied customers. These filters are at work in passenger cars, buses, commercial vehicles, tug boats, excavators, and wheeled loaders. Because modern injection engines required extremely clean and homogenous fuels—delivered with as little pulsation as possible. But water and small foreign objects get into the fuel during production and transport. This can cause the engine to misfire and come to a stop. Since it is extremely critical that the fuel filter functions perfectly, all vehicle and engine manufacturers recommend regular replacement at prescribed intervals.

A failure can make itself noticeable as follows:

• Engine is rough
• Lack of power under heavy load

Causes for a defect could be:

• Filter is dirty
• Replacement interval has been exceeded
• Refueled at a gas station where a tanker truck is currently filling the fuel system—this stirs up sediment from the bottom of the underground tank

Water in diesel is a constant threat to the affected vehicle components. It causes metal parts to rust and reduces the lubricity of the fuel, which can clog the fuel pump. With the new CleanLine spin-on oil filter, MAHLE offers optimal protection for commercial vehicles with diesel engines.

Three versions will be available worldwide:

• 2-stage CleanLine with integrated water reservoir (exclusively available in South America)
• 2-stage CleanLine without water reservoir (available in EMEA)
• 1-stage CleanLine without water reservoir (available in EMEA)

A failure can make itself noticeable as follows:

• Engine is rough
• Lack of power under heavy load

Causes for a defect could be:

• Filter is dirty
• Replacement interval has been exceeded
• Refueled at a gas station where a tanker truck is currently filling the fuel system—this stirs up sediment from the bottom of the underground tank

Many major automobile and engine manufacturers rely on the expertise of MAHLE for air filters—for good reason: engine performance, torque, low consumption, and minimal emissions require well-filtered air. And our cellulose (paper) filters, plastic non-wovens, or a combination of both can trap just about everything. They capture up to 99.98% of toxic dust, soot, and tyre particles. The finest filters trap nearly all particles larger than 3 µm. This means that MAHLE air filters prevent premature wear of valves, cylinder surfaces, piston rings, bearings, and other engine components. But be careful: in order for the filters to work perfectly, they must be replaced at the intervals prescribed by the automobile manufacturer.

In order to protect the filters from moisture, the intake port is designed to keep water away from the filter element as much as possible. If moisture does reach the filter anyway, we have added another layer of protection. Our filter papers are impregnated with a special synthetic resin that increases the resistance of the filter insert to water and chemicals. Glue beads on the backs of the folds help the filter elements retain their shape.

A failure can make itself noticeable as follows:

• Increased fuel consumption
• Reduced engine power
• Error code: Fuel mixture preparation/exhaust gas treatment

Causes for a defect could be:

• Filter heavily soiled (construction site operations)
• Replacement interval exceeded

The hydraulic oil in the steering system is constantly exposed to mechanical and thermal stress. Contaminants such as abrasion particles, dirt, and deposits can cause lasting damage to the steering system’s sensitive components—pumps, valves, and pistons—and compromise driving safety. MAHLE hydraulic filters for steering systems ensure that the hydraulic oil is continuously cleaned and that full system performance is maintained at all times. Manufactured to original equipment quality, they provide precise retention of dirt particles, thereby reliably protecting all hydraulic steering components from premature wear. Regular filter changes in accordance with manufacturer specifications are essential to ensure the operational reliability and service life of the entire steering system.

A failure can make itself noticeable as follows:

• Shifting problems with automatic transmissions
• Wear and tear on automatic transmission components
• The filter media has broken down (due to water in the oil)

Causes for a defect could be:

• Oil change interval exceeded
• Mixing of coolant and transmission fluid (leaky heat exchanger)
• Severe wear in the transmission (slipping clutches)

MAHLE cabin filters reliably supply the driver and passengers with clean air. They reduce dust on the dashboard and in the cabin, and avoid dangerous fogging of the windows. They also reduce the load on the blower and protect the HVAC system from contamination. Irreparable damage can occur to the air conditioning or heating system. The replacement intervals recommended by vehicle manufacturers should therefore always be followed. Rule of thumb: every 15,000 to 20,000 km. A regular sales driver for every repair shop.

A failure can make itself noticeable as follows:

• Fogged-up car windows
• Unpleasant odors in the car
• Allergy symptoms in the car

Causes for a defect could be:

• Clogged cabin air filter
• Extended replacement interval
• Clogged drain holes in the vehicle's air box—causing the cabin air filter to remain constantly wet

Pneumatic systems are primarily found in medium- to heavy-duty commercial vehicles. These pneumatic systems are used for many control and regulation processes—and typically for the brake system as well. Air drier cartridges from MAHLE ensure that these components function reliably and safely. They remove moisture from the air and thus prevent corrosion in parts such as lines and tanks. MAHLE and Knecht air drier cartridges meet and even partially exceed the requirements of all large commercial vehicle manufacturers. In order to guarantee the functionality of pneumatics, all commercial vehicle manufacturers require that the safety-relevant air drier cartridges be replaced regularly.

A failure can make itself noticeable as follows:

• Failure of the compressed air system (brakes, suspension, clutch, automatic transmission) due to moisture freezing in the system
• Shifting problems with the automatic transmission due to granules in the system

Causes for a defect could be:

• Excessively long filter change interval
• Leak in the pneumatic system, preventing regeneration and causing damage to the granules

MAHLE urea filters reliably remove contaminants from the urea solution that can damage injection nozzles and other sensitive components in the SCR system, thus ensuring that these components have a long service life.

SCR systems help to reduce nitrogen oxides in the exhaust gas aftertreatment of diesel engines and to meet increasingly stringent emissions guidelines. These systems inject a urea solution into the exhaust gas flow, which helps to convert the nitrogen oxides in the catalytic converter into harmless nitrogen and water vapor.

A failure can make itself noticeable as follows:

• Engine control unit error message
• Vehicle will not start
• SCR pump damaged due to dry running

Causes for a defect could be:

• Contaminants in AdBlue
• Service interval exceeded