Dear Xulfiqar, manual recommends NGK KR6A-10 spark plugs for PKDM Suzuki Wagon R.
Previous owner was using Denso XU22EPR-U plugs (22 transforms to 7 heat range of NGK).
I now installed NGK DCP7E plugs.
Any major issue in using 7 heat range plug instead of 6.
7 is a 'colder' plug as compared to 6, but it is still a "hot" plug.
Also, what's the difference b/w resistor type plug and Projector Insulator type spark plug?
Thanking in advance.
P.S according to my understanding, a colder plug wont heat up as much and thus will retain deposits in the longer run.