Please guide me as I am new. I need to know the plugs for my Toyota Corolla 1.3XLi 2003-2008 with the engine 2NZ-FE non vvti and has manual transmission. It had some DENSO K16-U11 plugs and i wish to upgrade them so i added some slightly used K16R-U11 plugs. Now the car is missing so can i add some old K16PR-U11 plugs? We will be replacing our car soon so would like some guidance. Other wise the car is fully maintained. Thanks.
(This is my family car)
if possible what is difference in the upper mentioned plugs ?