Hello!
Well Z-GEn 2NZ-FE 1.3L uses K Series Resistance Plug "K16R-U11"...
The One You Got Is "K20T-R11" as here comes difference in heat range....!
K20T-R11 comes in Bigger engines like 5S-FE and 3S-FE..
Well you get 20 instead of 16 means its cold range plug as compare to 16....! that might effect the normal internal combustion temperature of engine...!..
If your engine did detonation or self ignites fuel...its recommended then to use cold range plug....! in normal operation..it will reduce internal combustion chamber temperature...
well use it...and let us know details what you fells after putting then inside....!
as its winters now days so engine temperature needs to be normal enough to ignite fuel properly..so much cold temp can result in power loss....!
best of luck with them..
@fawi..its written in owner manual or you can simply find it on internet....let me know if you wont find....!i will do it..
@samadniazi...is your car CNG or petrol?....well Denso "J16AY" is recommended plug for your car from factory...!
Ppl mostly use W16Ex-U in charade as J16 series is much harder to find i think but J16AY have extended electrodes with dual ground electrodes.....!!
Regards