Originally Posted By: nitehawk55
Originally Posted By: JOD
Is there a documented instance of a Focus with a lifetime filter actually reaching restriction on the gauge? I remember looking at this when researching Focus wagons and I don't recall a single one. I view that system as a big plus for a used car, since you know that silicon ingestion during the life of the car is probably much lower. Absolute worst case--you'd have to change it once.
One thing to note when looking at these: if you want one with a Duratec 2.3, you may find them as old as 2003; California wagons with the PZEV engines used the Duratec 2.3 going back that far. The 2.0L is only available starting in 2005. (personally, I'd rather have the smaller engine and better FE, but to each his own).
I ended up getting a Transit Connect instead of a Focus wagon, but I think it a great car. If I found with a 2.0 5 speed at the right price, I'd still consider it.
One thing I notice when the lifetime unit is replace is the comment in improved power . I don't know if that would always include improved fuel economy but it is mentioned in some reviews getting as much as a 3-5 MPG improvement . If that's the case it's worth a look . Problem is there is so many variables with these reviews and the like , you really don't know if it's on the level or not .
I will say my sons 05 with the 2.0 5 speed is zippy and easy to get a speeding ticket if you don't watch it !
Any claims about increased fuel economy are simply due to the power of suggestion. A restricted air filter isn't going to impact fuel economy in a fuel injected car unless the car is barely running. Let's forget for a second about published research research on the subject (which is
very clear . Just ask yourself "why would it matter?" If the car needs more air, the TB simply opens more. That's why cars have MAF sensors.
The link above addresses the whole "power issue" as well. Sure, at WOT a restricted air filter may cost a couple of HP. Realistically, that's just not an issue for a daily driver--and the filters showing any loss in HP are SEVERELY restricted, like shirts wrapped around dirty air filters sort of restricted!
I've seen some anecdotes on the Focus forum from some guy who claims he got 6mpg better after changing his air filter or whatever, but I put it straight in the "nonsense" category. I've never seen anyone actually say they've had restriction on that thing. I'd view it as a real plus on a used car--way better than some guy "cleaning" his air filter by hitting it on the ground and reinstalling it!
