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An oil separator includes a casing 1 and a rotor 2, said rotor being arranged rotatably within said casing and having a flow chamber 3 through which oil-laden air 4 can pass, with porous material being arranged in the flow chamber 3. At least one unit of porous material is arranged in the flow chamb

An oil separator includes a casing 1 and a rotor 2, said rotor being arranged rotatably within said casing and having a flow chamber 3 through which oil-laden air 4 can pass, with porous material being arranged in the flow chamber 3. At least one unit of porous material is arranged in the flow chamber 3 which includes outer layers of a porous metal 6 and an interlaid layer 7 comprising fibre material.

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1. An oil separator, including:a casing, a rotor, said rotor being rotatably mounted within said casing and including a flow chamber through which oil-laden air can flow, and a porous material through which the oil-laden air can flow positioned in the flow chamber, the porous material comprising an

1. An oil separator, including:a casing, a rotor, said rotor being rotatably mounted within said casing and including a flow chamber through which oil-laden air can flow, and a porous material through which the oil-laden air can flow positioned in the flow chamber, the porous material comprising an outer layer comprising a porous metal and an inner layer comprising a fiber materials, wherein the layer comprising fiber material is enclosed by the porous metal at its axial sides and at its radially outer side. 2. An oil separator in accordance with claim 1, wherein the layer comprising fibre material is enclosed in a grid form intermediate casing.3. An oil separator in accordance with claim 2, wherein the layer comprising fiber material includes at least one axial spacing element.4. An oil separator in accordance with claim 3, wherein the layer comprising fiber material includes at least one radial supporting element.5. An oil separator in accordance with claim 4, wherein the supporting element is in the form of a gauze meshwork.6. An oil separator, including:a casing, a rotor, said rotor being rotatably mounted within said casing and including a flow chamber through which oil-laden air can flow, and a porous material through which the oil-laden air can flow positioned in the flow chamber, the porous material comprising an outer layer comprising a porous metal and an inner layer comprising a fiber material, wherein the layer comprising fiber material is enclosed in a grid form intermediate casing. 7. An oil separator, including:a casing, a rotor, said rotor being rotatably mounted within said casing and including a flow chamber through which oil-laden air can flow, and a porous material through which the oil-laden air can flow positioned in the flow chamber, the porous material comprising an outer layer comprising a porous metal and an inner layer comprising a fiber material, wherein the layer comprising fiber material includes at least one axial spacing element. 8. An oil separator in accordance with claim 7, wherein the layer comprising fiber material includes at least one radial supporting element.9. An oil separator in accordance with claim 8, wherein the supporting element is in the form of a gauze meshwork.10. An oil separator, including:a casing, a rotor, said rotor being rotatably mounted within said casing and including a flow chamber through which oil-laden air can flow, and a porous material through which the oil-laden air can flow positioned in the flow chamber, the porous material comprising an outer layer comprising a porous metal and an inner layer comprising a fiber material, wherein the layer comprising fiber material includes at least one radial supporting element. 11. An oil separator, including:a casing, a rotor, said rotor being rotatably mounted within said casing and including a first flow chamber through which oil-laden air can flow, a first porous material through which the oil-laden air can flow positioned in the first flow chamber, the porous material comprising a porous metal, a second flow chamber through which the oil-laden air can flow positioned downstream of the first flow chamber, the second flow chamber being connected to the casing, and a layer comprising a fibre material through which the oil-laden air can flow positioned in the second flow chamber. 12. An oil separator in accordance with claim 11, wherein the layer comprising fiber material is enclosed in a grid form intermediate casing.13. An oil separator in accordance with claim 12, wherein the layer comprising fiber material includes at least one axial spacing element.14. An oil separator in accordance with claim 13, wherein the layer comprising fiber material includes at least one radial supporting element.15. An oil separator in accordance with claim 14, wherein the supporting element is in the form of a gauze meshwork.16. An oil separator in accordance with claim 11, wherein the layer comprising fiber material includes at least one axial spacing element.17. An oil separator in accordance with claim 16, wherein the layer comprising fiber material includes at least one radial supporting element.18. An oil separator in accordance with claim 17, wherein the supporting element is in the form of a gauze meshwork.19. An oil separator in accordance with claim 11, wherein the layer comprising fiber material includes at least one radial supporting element.