NGK ITR5F13 spark plugs

[plex07st]

Just changed out my spark plugs that are original from the factory, and low and behold, they're not Motorcraft plugs! I googled ITR5F13 and found out they are NGKs. Is this standard practice from the factory? Anyway, replaced them with Autolite APP104. Hope they last for 100K miles like the originals.

[Sponsor]

[whynotthinkwhynot]

Actually, those Autolites are better plugs IMO, but as long as the plugs weren't damaged, you should be fine. You might notice some changes in fuel economy over a period of time, but it should be for the better.

[plex07st]

whynot,
Was not sure what you meant by "as long as the plugs weren't damaged, you should be fine". The Autolites are brand new.

[NorCaLarry]

I just changed my plugs and was surprised to find that installed were NGK Iridium from the factory. My Focus was built in Mexico, could that be the cause? Anyhow I put Autolite Copper 104s hoping to get better mileage/performance. My 2005 Focus ZX3 has only 34,000.

[sailor]

If memory serves, the only time someone "proved" an opinion in a spark plug debate here, it was that the "coppers" actually gained a SMALL amount of H.P. when new.

Downside is that they are relatively short lived, NOT 100,000 mile plugs - more like 10,000 as I remember, so annual tune-ups (never hurts) are back on your schedule...

Cheers!