I checked the filter in mine yesterday when I was pulling the Disco apart to do the timing belt (which ended up being a complete stuff up) and it is deffinatly working.
When fitted the filter was stark white, now it has a grey tinge to it and it smelt like sump oil but there was nothing in the bottom so the drain is also working so Im happy.
I'll leave it alone until it's ready for service now and see how black it gets.


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. I'm guessing it'll take at least 5,000 km to become "wettened" with oil.

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