Nine CSL Newbuilds Eliminate oil usage with seawater lubricated propeller shaft bearings. The drive for pollution free ships continues as Canadian-based ship owners, CSL Group Inc., eliminate oil from the stern tube and equip nine of their latest new builds with seawater lubricated propeller shaft bearings. CSL has specified non-metallic propeller shaft bearings that use seawater rather than oil to lubricate the shafts on the Trillium Class vessels built at Chengxi Shipyard and Yangfan Shipyard in China.