KV6 inlet manifold and catch tanks

I've just fitted a new inlet manifold to my KV6, having bought it recently with a known manifold problem. I would like my new and expensive manifold to last a while.



People recommend fitting oil catch tanks and think that by collecting this oil they are doing their inlet manifold a favour. They might be reducing the risk of oil contamination of the VIS motors, but from what I can tell the main cause of failure is not the motors but the failure of the plastic arms and rose joints that operate the butterflies.



The thing I don't quite understand is that if clean oil vapour is getting into the manifold it must assist in lubricating the butterfly operating arms and joints. Without the presence of clean oil mist, won't failure happen sooner? Does wear happen because people have neglected to change air filters or run their engines without correct air filtration?



Do frequent (good quality) oil and filter changes (something I have done which has kept my 1.4 45 running sweetly at 163,000 miles) mean that the oil mist is reduced and/or quality of the oil mist is better because the oil is cleaner?



Rover must have realised that oil mist will enter the manifold when they designed the car.



Any pointers gratefully received.

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