What could be an early indication of excessive blow-by? Follow Early indication of excessive blow-by is when you see large amounts of oil passing through the drain system. Related articles How do I check for leaks? Operating & Filling Procedures Why use genuine Bauer approved spare parts and lubricants/ oil? Bauer approved spare parts and lubricants / oil Installation manual for Bauer high pressure compressor systems Comments 0 comments Please sign in to leave a comment.