DL06 Diesel Engine Technical Information 51 Condition Causes Remedies 7) Oil Consumption Excessive (1) Oil level elevated (2) Oil level lowered (3) Oil leak z Clearance between cylinder liner & piston Replace z Wear of piston ring, ring groove z Piston ring's damage, stick, wear z Piston ring opening's disposition improper z Piston skirt part damaged or abnormal wear z Oil ring's oil return hole clogged z Oil ring's contact poor Replace piston, piston ring Replace piston ring Correct position Replace piston Replace piston ring Replace piston ring z Looseness of valve stem & guide z Wear of valve stem seal z Cylinder head gasket’s leak Replace in set Replace seal Replace gasket z Looseness of connection parts z Various parts' packing poor z Oil seal poor Replace gasket, repair Replace packing Replace oil seal