It’s not uncommon with heavy duty spin-on oil filters (late model diesel engines) to use a large dia nut plate thread, sometimes to the extremity of the ‘can’ diameter. This is mostly due to high volume oil pumps circulating oil through the lubricating circuit assisting with cooling critical internal engine components. Many media’s in late engine designs use a blend of cellulose and synthetic fibres. The composite media affords some good results:
- Increase in dirt holding capacity
- Resistance against ageing products in the oil.
- Enhances the purpose of long-life oils.
A number of heavy duty applications use a combination filter which comprises a full flow section and a part flow section. Each section has a different media. Firstly, the full flow media requires sufficient open pore to enable high flow but tight enough to trap minute particles in suspension before they reach critical running surfaces and engine componentry. The part flow media is usually a much tighter media to take over where the full flow media finishes but some part flow sections have another role purely to capture harmful soot produced – eg EGR engines.
Many current model engines in passenger vehicles use a multi-function oil filter module which includes; oil separation, heat exchanger for cooling, thermostatic controller, crankcase pressure control, and more.