In the past I've used Vauxhall's own, NGK, and Bosch Super 4s. I noticed that NGK seems to give the best performance etc., Bosch Super 4s actually didn't seem any better than the OE stuff from Vauxhall, so should I go for NGK again, or is there another manufacturer that is better than them?
Also from reading past threads on MIG, it seems better to use spark plugs with a single core I think it's called? Wears out quicker but gives better performance? Is this all true?
I have an Astra with the C14SE (1.4 8v MPi) engine by the way.