O-rings were too thick. I had to work very hard to get the bottom plate over the o-ring on the stem and the large plate was too thick and didn't fit properly. I poured out about half a liter of oil and had to completely change the oil with matching o-rings. In the garage it didn't leak, but under pressure with the engine running. I used to use K&N with no problems but they gave up on this one.
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