Hi JZ, in one of your post reply in this thread you mentioned BOSCHE WR78 for small cars like mehran etc. I want your recommendations for my car. Mehran 2010 CNG, 22,000 KM driven, stock plugs. They are not giving me problem like missing etc. I don't even know if they are retired or not. Can you pls tell me that how long should I go with stock ones. If I should replace, which plugs you recommend. I want plugs for good performance.
Regards.