Hands-on advice for replacing spin-on oil filters

▶ The latest technical messenger bulletin from MAHLE has warned of the dangers of using tools when installing spin-on oil filters. Oil filters are available in two variants that not only differ in design, but also contrast significantly in the way that they’re replaced. There are filter elements (OX) and spin-on filters (OC). With the latter, reinstallation by hand will prevent damage such as corrosion and, ultimately, oil leakage.

In the case of OX filters, the cover of the oil filter housing is loosened with a tool, such as a socket spanner, and then retightened using the same tool once the filter element has been replaced.

It’s crucial, says MAHLE, that you pay special attention to the oil filter flange seals in case these are corroded and require replacement. The old seal should be replaced and cleaned, and the new filter seal should be coated with clean engine oil.

The new spin-on filter should be screwed into place by turning it the specified minimum number of times until the seal is in contact with the block, and then tightened by hand to the specified torque, or angle of rotation.

Tightening the filters with a removal tool can damage the surface coating, leading to serious problems. Because the spin-on filter is often in an exposed position on the engine, it’s subjected to high levels of stress from water spray, exhaust heat and other debris. It can corrode rapidly if the protective coating is damaged. Constantly changing temperatures and winter road salt can accelerate rusting to the point where the filter leaks and oil escapes.