lem0n
Member
Hi guys, been on the gaming side of GAF for a few years but only recently ventured in this side and saw this thread.
I am glad I found this thread because there isn't the crazy fanboyism you would find in your typical car specific forum.
Anyway, just wanted to introduce myself. Personally I am a fan of practical performance cars in the $20-40k range (namely hot hatches) since I would drive something I can cart around friends or family in and that price range forces the auto makers to use their engineering and manufacturing skills to come up with their best balance of performance, comfort, and features.
Also got a question for you guys. I have a '12 Focus with about 85k miles. Should I be considering replacing my spark plugs even if I haven't had any issues with them? And if I do, are the more expensive spark plugs worth the price?
OEM for a '12 Focus is an Iridium plug, go with the Motocraft SP535. Copper or platinum won't perform as well. Also, iridium plugs are rated to 100k miles, so it's worth the price of admission. NGK is the only other alternative you should consider.
Yes, I'd replace them. I like to replace mine a couple times a year at least.
As for your last question: yes and no. It really depends on your specific motor and usage. I don't think you'd notice much of a difference between some cheaper plugs and more expensive ones on a car like a Focus. I think as long as it performs like OEM, you'll be fine.
God, how many miles do you do a year? Replacing spark plugs like air filters is not necessary, unless of course you do a ton of miles and use copper/nickel core plugs. Also, the direct injection engine in the new Foci are pretty advanced, so you really should stick to OEM iridium plugs. If we're talking 1st gen SOHC motors, then yeah, any old copper will do.