Porsche Hastech Engineering Porsche 911 Crankcase Ventilation Oil Blow by Separator H911 106 KIT 616 107 015 00 Porsche Bilstein strut insert for Option:Without Access Holes Porsche Bilstein strut insert for 911 (Oct 1968 1989) and speed sensors Fits all aircooled Porsche 911 models from 1965 through 1998 Features and Benefits:Reduces the oil blow by from the crank ventilationKeeps the oil in the engine while still allowing good crank ventilationVery simple mounting sandwiches between the crankcase and ventilation the lid breather coverUsed on all Hastech race & street enginesRecommended for all aircooled Porsche 911 engines to help reduce oil consumption caused by ingestion of oil laden air into the intake caused by excess crankcase windage and blow by