I've been doing some work on my C-Max since I am now comfortable driving and have had it for about 3 months. I put some grill covers on to help keep the Minnesota cold out. They're made with foam pipe insulation, and they do help the car warm up faster. I don't think they help with fuel efficiency that much though. I replaced the cabin air filter, which is a pain but not nearly as bad as everyone made it out to be! Just don't worry about forcing the new filter in, I guess that's the only way to get it in the housing. I checked the engine air filter which is as clean as new, compared to the disgustingly dirty cabin air filter. I went to rotate the tires, and I had a hard time getting the lug nuts to come off and I rounded the corners on one of them. ARGH! I went to the dealership today, to do the works package, because I couldn't rotate the tires, and didn't feel like changing the oil, on top of some warranty work. Anyhow, they said that I really hadn't done any damage to the lugs because there is a chrome plated lug cap on each of the lug nuts that was merely decorative. First off, is that really true that the car has decorative lug nut caps? And secondly, how in the heck do you get them off? I took a pliers and a rag to them after I got home and couldn't get them to come off! I was wondering what I would do in case of a blowout and wanted to take the tire off myself.