Need suggestion regarding Best geniun Spark plugs for alto 660cc
I have JDM alto 2004 manual. It has stock sprak plugs in . Once i replaced the plugs purchased 350Rs each 1050/3.
Car started knocking with new spark plugs. Kindly guide me which best plugs are available. price, quality,
plz share picture if possible. it will help me alot
Note: with old spark plug, car has no issue, give me mileage of 18km/L long route, 15,16 km/l local.
but the tip of plugs is narrow after frequent cleaning.
thanx in advance