I recently changed my spark plugs on 2012 Ford Focus. I used Bosch and got a 3 MPG boost.
I used NGK at 100k miles and have been happy with them.
Skip the genuine spark plugs and just get NGKs. And skip the genuine oil change kit and get pentosin if you wanna stay oe
Since I mounted Bosch 4-prong spark plugs, fuel economy has improved a lot. Gone from 12-13 km/l to nearly 15 km/l.
7751 are the OEM plugs and rated for ~105k miles, give or take.
I have only used Bosch plugs in my cars, and I have not had any issues with them yet.
I like my NGKs a lot. Never had any issues with them and they perform well
The only thing I noticed when it was extremely hot and humid my car was slow in accelerating.
I've heard for many decades how bad Bosch spark plugs are and I figured the coils would be just as bad, if not worse.
Bosch spark plugs are junk.
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