I have a 2004 Mazda 3 with about 93,000 miles on it. It seems that every one I know is putting cold air intakes on their cars and I've been wanting one for a long time. I love the way they make your car sound. Is there a certain kind I need to get for my car? What company makes the best ones? What is a good price range? How much does installation usually cost? What's a good website to look on? Please, I need help!

 

I bought a 2004 Mazda6 3.0L new in Feb. 2004. My car has over 135,000 miles on it, and it still has the original engine. I have always changed the oil with a high quality, full synthetic oil, about every 3,000-4,500 miles. While I agree that, with full synthetic oils, you can wait a little bit longer, I always want clean oil. My advice to use it.

 

I can't imagine that changing anything that might upset the engine tuning is a good idea. Changing anything related to the tuning and emission system invariably has unexpected consequences that then have to be dealt with. My 2004 has been the most unreliable and expensive POS I've ever owned, and the engine is the only part that's been relatively trouble free. I'd leave well enough alone.