2010 Hyundai Accent 1.6L had a clicking noise on cold start. I think lifter. (?) Added Sea Foam to oil. Quieted. How often can I add SF to oil? Will the SF burn off as it cleans. I have added a 16 oz can. Oil dipstick reads at full now (after 3 weeks). I do NOT want to overfill crankcase. Thx!