It might be worth taking a look at the engine air filter earlier. In the case of the s Touring with the 2.5-liter engine, the Scheduled Maintenance sheet for the United States shows replacement of the engine air filter takes place at 37,500 miles, or at 35,000 miles if the owner is following the severe service schedule. Nevertheless, I changed mine at 30,000 miles - it was very dirty and should have been changed many thousands of miles earlier.30k service should include both your engine and in-cabin air filters
I'm familiar with that line of thinking, and I agree with it - not that I have any specific experience or knowledge in the subject, mind you.QUOTE: "...Nevertheless, I changed mine at 30,000 miles - it was very dirty and should have been changed many thousands of miles earlier...."
Air filter engineers say noone can judge the condition of an air filter by appearance, except that it looks dirty. Because of this, many heavy-duty vehicles have air filter restriction gauges to tell the operator when the air filter is too dirty, which causes excessive air restriction which harms performance but does not harm the engine through contamination.
Ironically, air filter pros claim that an air filter actually filters better after some dirt is on it, as the dirt layer actually allows more, finer filtering. So, as an air filter progressively gets dirty, it filters progressively better.
I would think the factory's miles-to-change recommendation is good, unless perhaps the car has been driven in a lot of dust storms or the air filter somehow gets soaking wet or is damaged in some way.