Hi folks,
Having a similar dilemma here with my 2006 2.0 6. I purchased some Bosch plugs from EuroCarparts using their reg number look up, and I got sent plugs with a 17.5mm thread. When I took out the old ones, those were NGK ILTR5A-13G with a 25mm thread. So, either the ones supplied to me are the wrong thread length, or the ones previously installed (which must have replaced the original Mazda items at some stage, the car currently has 90k miles on it and I've had it since 65k) were the wrong thread length.
But there's another wrinkle: the NGK ILTR5A-13G recommended above are listed as a 17.5mm thread on Opie website, but as 25mm thread on EuroCarParts/CarParts4Less. There's also an NGK ILTR
6A-13G on Opie with a 25mm thread length. I suppose Opie have got it wrong? To find out, I called two separate Mazda dealers. They want £90 (!) for a set of 4 plugs, and neither of them could confirm for me which length they are as they don't keep them in stock and it would take a few days to order in. I also called ECP and Opie, neither of them could shed any light and referred me to the manufacturer. Hmm.
What's going on here? Nobody, not even a dealer, seems capable of giving me an answer.
Has anyone on here ever taken out the original Mazda plugs from their cars, and if so can they remember if they are 25mm or 17.5mm thread?
This is driving me round the twist. The old one which came out broke (the ceramic/plastic/ whatever top bit broke off), so I now have a car I can't use until I've worked out if I've got the right plugs or not. Any help would be appreciated.
Thanks all!