The oil/air seperator's really show their worth when doing some track time. I noticed after laps at wanners there'd be fresh oil around the collection collar of the seperator. My experience of rexes doing laps at wanners tends to show a good bit of oil in the ole oil catch can, even to the point of flooding the breather on the passenger side head due to the number right hand turns ( you would need to be carrying consistent G's for this extreme however). Very good investment for the weekend motorsport enthusiast. Or under bonnet ricer
