My apologies Artem, the 530,200 mileage figure was really a note to myself for when I just changed the PCV valve.
The thing is that I used to change the air filter and the PCV valve at 12,000 miles. Since I've been on this web site,
I learned that changing the air filter too often is not the best choice. So, I haven't been changing the PCV valve as
often as in the past. This one went 30,000 miles. I will have to rework my PCV valve interval back to 12,000 miles.