One essential condition required for an internal combustion engine to operate properly is to constantly lubricate the moving parts of the engine with oils maintained at the necessary level of cleanliness so as to prevent any premature wear. The oil filter provides continuous purification of the oil, by retaining abrasive particles which are caused by normal wear and tear, and also dust and combustion residues. Oil filters can be designed as ‘spin-on filter’ or as ‘filter-cartridge’ in housing