After 30,000 and some miles I decided to replace the filter/separator element.

After the car was left unused for a couple of weeks, the filter was fairly dry of oil. However you could feel soot deposits on the surface of the coaelescent element: that's why it has to be replaced on a regular basis. As the filter shed oil, some solid particles are left behind and eventually clog it.

Mann-Hummel says the replacement interval depends on the application; on the Cummins is every 67,000 miles; one could also monitor crankcase pressure and see how it is affected. I decided to replace when the service reminder with the car on the lift is due (roughly every 26,000) so I have a reminder. That's the same time I do the air and diesel filter.

On other news, the hoses are seeping oil again. I'll replace them with a different type over the weekend and show you then...

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