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If you really want to determine if it's the filter, then you should change only the filter, leave the PP (and don't forget to check your oil level before and after doing so). If you change the oil AND the filter, then you cannot draw any real conclusions should you actually see your mileage...

Yeah. I seem to recall my trusted former Mazda Master Technician friend/mechanic mentioning something about some oil viscosity factory specification issues on the naturally aspirated 2.3L Mazda 3's. I should give him a call and see what the deal was with that again.

That I do. Traded in my Mazdaspeed MX-5 for it. After four Miatas, I finally gave in to having a practical car and I love it. Still adjusting to the whole concept of being pulled down the road instead of pushed, but it handles great and the DSC does it's job (when I decide to leave it on), so...

I have a Mazdaspeed 3 (2.3L 4 Cylinder Turbocharged). Owner's manual calls for SM 5W30 for all climates. The car will most likely never leave Texas during the winter time, so sub-freezing temp performance doesn't matter much to me. I have a 5 mile commute that is a straight shot down the...

blackdiamond, i'm curious to know what you decided to go with and why? i tried tracking through your previous posts, but seems like you jumped around quite a bit and i couldn't find for sure what you decided on. i also have an MS3 and am about to get my first oil change (~2k miles). thanks!

I note that the person calling the Mazda 3 a POS is driving an LS400. Of course it's going to seem cheap and noisy to someone driving a big Lexus. I also recently purchased a Mazdaspeed 3 after driving four different Miatas over the last ten years and, coming from the other end of the...