Oil control is a problem which can effect the Subaru's "Flat Four Boxer" engine design more than most due to its high crank case pressure and horizontal engine design. This is one of the reasons we have spent so much time at RCM developing various products and systems to help keep the oil around the oil pickup pipe where it's needed, to be distributed around the engine. When cornering at high speed the design of the Subaru engine means that oil can work its way out of the sump oil pan and flow across to the cylinder head castings, leaving a lower volume of oil behind surrounding the oil pick up pipe. The job of the oil pick up pipe is to suck oil up out of the oil sump pan and distribute it around your engines oil galleries (ensuring precious moving engine components are kept lubricated and cool at all times). If oil is not available to the pick up pipe then naturally many areas of the engine do not receive the precious lifeblood they need to survive, temperatures rise, and ultimately components fail. Included in the kit is the the RCM baffled sump which puts a "lid" on the container holding the engines oil, ensuring that if the momentum of the vehicle is thrown to one side the oil still remains in its designated area. On a standard engine oil vapours from the crankcase and cylinder heads are usually recycled back through the air intake system. The downside of this is that the intake hoses, turbo, intercooler and connecting pipe work can all see a build up of oil over a period of time which in turn slows air flow, reduces cooling abilities and causes general wear and tear. Fitting a catch tank kit enables you to vent all excess vapours directly into a separate tank where the oil is then separated from the damp air before being returned directly back into the sump oil pan. This ensures your engines breathing system is kept clean and free of oil residue to maximize its efficiency and can be especially useful in high performance or tuned applications where dense oil vapour can have a detrimental effect on performance. Further advantages of an RCM catch tank kit is that aside from receiving all the corresponding parts required for a complete installation, we also supply an oil drain hose which connects between the catch tank and the sump meaning your precious oil is never left filling up in your tank and instead is returned back to the engine where it belongs. Unlike universal tanks all RCM tanks are manufactured specifically for the Impreza which guarantees easy, straight forward fitment for that factory appearance. Please see compatibility section below to confirm suitability for your vehicle application.
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