and propylene can also be produced directly by cracking crude oil without the need of using refined products of crude oil such as naphtha. [ ] [ ] oil refineries are typically large, sprawling industrial complexes with extensive piping running throughout, carrying streams of fluids between large chemical...
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or insufficient gearbox oil level. one of the most overlooked parts of car maintenance is keeping your gearbox oil fresh and filled. the more the clutch and transmission works, the more the oil is subject to "shear". it loses its viscosity and results in the overheating of some components and their...