3.3 Batch and continuous lubricating systems In the case of small engines containing a rather small quantity of oil in their crankcases. a tank should be included in the system The oil required for filling the purifier bowl and pipe work, etc is drawn from this T tank the oil level in the engine thus remaining constant3.3 Batch and continuous lubricating systems • In the case of small engines containing a rather small quantity of oil in their crankcases, a tank should be included in the system. • The oil required for filling the purifier bowl and pipe￾work, etc. is drawn from this tank, the oil level in the engine thus remaining constant