What are the gaskets made of? Because the k04 is starting to get close to its max efficiency, if it is mounted in an area that does not let heat desipate well, the gaskets may be expanding and contracting very quickly when you run your car hard, then shut it off. A turbo timer helps cool oil and get rid of some excess oil because oil is not a great heat conductor anyway, and your turbo will cool alot between wot heat levels and a few minutes of idling, but depending on the gasket material, the gaskets may take longer to cool and when you are running it at extremely high temps (a turbo near its peak efficiency, and in a confined area in the engine bay) those gaskets are gonna cool real quick after alot of heat and eventually either damage themselves, or not fit properly. aftermarket gaskets may help or mazda will probably (sounds like they already have) produce new gaskets that fit the application better.