I recently picked up a 2006 Mazda3 grand touring with 149K miles. I usually replace all fluids, radiator hoses, filters, spark plugs, brake pads, etc. when I pick up a used vehicle. Is there something I'm missing that might be critical. This is my first Mazda after years of of Honda, Toyota, Chevrolet. I'm handy and can perform most repair chores short of welding with cars. I normally would have gone with something I know, but the deal was too great to pass up. I had my 2008 Honda Odyssey up to 800K before it got totaled by an uninsured driver in 2015. I bought this Mazda3 to replace an 2003 Corolla with over 550K miles. The corolla mechanically is fine, but rusting out. I had a section of the floor board rust out on me ( think of Fred Flintstone's car to get an idea), so I figured it was time to replace it. I did do a search here and some things were answered but a lot weren't. Any advice is greatly appreciated.