Originally Posted by RichardV6
Originally Posted by Perry_P_M3W
I can't seem to find, or should I say, feel confident that I know which spark plug I should be ordering for a 1.6 Sigma engine. Any pointers and/or recommendation on what brand is recommended and/or part number?

The NGK catalogue quotes an LTR51X-11 plug as the iridium upgrade for the 1.6 Sigma from 1996 - 2018.

Thank you Richard, very kind of you to provide a link!