Originally Posted by david46816
I have used bosch plus 4's in my wife's van and she seen actual milage increase by almost 60 miles to the gallon
But, does it have a fOCUS engine, or something different?
2.0 SPI, Zetec, or Duratec, or the 2.3 Duratec?
I realize, in some vehicles they most likely do work OK in, but for the fOCUS, they're not recommended.
Here's what a few FF members had to say about Bosch plugs:
I tried them (Bosch Plat+4) in my 4.2L V8 Mustang, and 1.8L Lancia.
cases, they worked good to excellent for about a week, and then they went to crap after that.
I've never tried them since.
And, to the above poster, InPsychOut
Second off, you might think twice about the Motorcraft SP-463 for your wife's car.
That plug is a colder heat range than the standard plugs in your model car.
(FYI, This thread in is in the SVT area)
I know there was a recent discussion in the Zetec forums about that very plug,
and what the heat range difference may or may not do to the engine.
Lemme find the thread...
Here it is:
To me, plugs are so easy to change, I opt for the best conductor (copper) and change them more often.
There's no reason you can't get 30,000 miles or more out of a good set of copper plugs.
The other plugs will last longer, but I've also seen 100,000 mile plugs that have frozen to the head so bad they broke,
and new threads (heli-coil) needed to be cut into the head.