Mga Sir what could be possible cause ng white smoke during idle only and sometimes pag reverse ko?Car is 7g Galant.I add only 1 liter of oil every 5 mos para lang ma top up. Is that bad already? Pati sunog ng sparkplugs ok and early morning startups nagtutubig pa. Di ko alam whats the cause. Do I need a compression test to determine if my seals needs to be replaced or piston rings maybe? TIA