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An oil and air separation can includes: a diffuser tube positioned within a diffuser shield at a can intake for blow-by gases; and a first diffuser screen spaced vertically apart from a second diffuser screen proximate a can exhaust for blow-by gases, wherein the first diffuser screen and the second

An oil and air separation can includes: a diffuser tube positioned within a diffuser shield at a can intake for blow-by gases; and a first diffuser screen spaced vertically apart from a second diffuser screen proximate a can exhaust for blow-by gases, wherein the first diffuser screen and the second diffuser screen are spaced horizontally from the diffuser tube and extend about the diffuser shield.

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1. An oil and air separation can for an engine positive crankcase ventilation (PCV) system including: a diffuser tube positioned within a diffuser shield at a can intake for blow-by gases; and a first diffuser screen spaced vertically apart from a second diffuser screen proximate a can exhaust for b

1. An oil and air separation can for an engine positive crankcase ventilation (PCV) system including: a diffuser tube positioned within a diffuser shield at a can intake for blow-by gases; and a first diffuser screen spaced vertically apart from a second diffuser screen proximate a can exhaust for blow-by gases, wherein the first diffuser screen and the second diffuser screen are spaced horizontally from the diffuser tube and extend about the diffuser shield. 2. The oil and air separation can of claim 1, wherein the diffuser tube includes a plurality of holes permitting fluid communication between the can intake and a lower interior portion of the diffuser shield. 3. The oil and air separation can of claim 2, wherein the diffuser tube includes a flange portion at a lower end of the diffuser tube. 4. The oil and air separation can of claim 3, wherein the flange portion extends from a diffuser tube sidewall to proximate an interior sidewall portion of the diffuser shield. 5. The oil and air separation can of claim 1, wherein one of the first diffuser screen and the second diffuser screen is perforated. 6. The oil and air separation can of claim 5, wherein the first diffuser screen is disposed below the second diffuser screen, and the second diffuser screen is perforated. 7. The oil and air separation can of claim 1, wherein the first diffuser screen and the second diffuser screen extend from an exterior sidewall of the diffuser shield to proximate an interior sidewall of the can. 8. The oil and air separation can of claim 1, further comprising a mounting bracket removably attached to the can proximate a blow-by gas intake. 9. A screen assembly adapted to fit an oil and air separation can for an engine positive crankcase ventilation (PCV) system including: (i) a diffuser tube disposed within a diffuser shield, and (ii) horizontally spaced from the diffuser tube, outside of the diffuser shield, a plurality of diffuser screens that are vertically spaced from one another. 10. The oil and air separation can of claim 9, wherein a first diffuser screen is spaced below a second diffuser screen. 11. The oil and air separation can of claim 10, wherein the second diffuser screen is perforated. 12. The oil and air separation can of claim 10, wherein the first diffuser screen and the second diffuser screen are each perforated. 13. A method of oil and air separation for an engine positive crankcase ventilation (PCV) system comprising: providing a can and a diffuser tube positioned within a diffuser shield at a can intake for blow-by gases; and a first diffuser screen spaced vertically apart from a second diffuser screen proximate a can exhaust for blow-by gases, wherein the first diffuser screen and the second diffuser screen are spaced horizontally from the diffuser tube and extend about the diffuser shield. 14. The method of claim 13, wherein the first diffuser screen and the second diffuser screen are each held in place relative to one another by o-rings. 15. The method of claim 13, wherein the diffuser tube partially defines an annular space between the diffuser tube and a portion of the diffuser shield. 16. The method of claim 15, further comprising a filter material disposed within the annular space. 17. The method of claim 16, wherein the filter material comprises stainless steel mesh. 18. The method of claim 13 including a flange disposed at a lower end of the diffuser shield. 19. The method of claim 18, wherein the flange has an outer diameter that is less than the inside diameter of the can.