Answer for What are the reasons for the absence of adequate pressure in the engine oil ?

(a) Lack of oil in the oil chamber.
(b) Engine oil may be thin.
(c) The main and the big-end bearings may be worn out.
(d) There may be some obstruction in the filter, oil pump or pipes because of grit, dirt or other foreign materials.
(e) Leakage of oil.
(f) Oil pressure release valve is opened.
(g) Pump could be out of order. Lubrication System 29 sure.