I own a 2003 Mazda 6/2.3 L for a little over a year now. I decided finally to change my own oil instead of going to the dealer and pay the high-inflated price. After 2 weeks of searching, I finally located a filter via Advanced Auto parts. I opened the package and notice a canister filter with 2 rings (small and large). Its foreign to me, since the only oil changes I done was to my 91 MR2. I was discouraged because I never saw a filter like it. I decided to take my Puralotor filter and car to an express lube place to get my 1st synthetic oil change. After parking the 6 in the pit, they popped up the hood and a few minutes later, the manager approach me stating they can’t change my oil because they don’t have the tools to do it. They specify that a 6-sided tool was needed to remove a part to get to the oil and filter and they never changed a 2.3/L 6. They advised that I should take it to the dealer. That was that; wonder if this is a myth? Anyone had experiences changing their 6s’ oil? Any insight would be appreciated?