Definitely a bad valve cover gasket. I changed my spark plugs a couple months ago and I had hella oil on my 4th spark plug. Replaced the valve cover gasket and it fixed my issue 100%.
Just installed NGK 92274 in a 2021 Mazda 3. They are 'Ruthenium' instead of iridium, seems to be their newest plug available. Just don't touch the gap, it was perfect at .044. Runs great.
The gallon of Castrol is the same whether you buy it at CT or Napa.
Currently 182,000 on my 2012 Mazda 3 2.0 Skyactiv. Still runs great, only oil changes have been done and other fluid flushes. Routine maintenance and new drive belt, New clutch, Hydraulic cylinder, and suspension and ball joints have really been the main things i had to take care of. It was more of preventable maintenance doing the things i did before stuff actually went bad(broken). Besides the fuel pump lol
Just replaced all four brake pads and rotors on my 2018 MZ3 hatch with 46,000 miles. Used Bosch quiet cast brake pads and rotors. Paid around $350 for parts and took me around three hours.
The stock tires suck. They last less than 20k miles on my Mazda, so I opted for the Continental DWS06+, which have been fantastic.
I think you may have over spent. I have same thing but I replaced mine with Firestone Firehawk 500s they look great make the car handle awesome and didn't cost an arm & leg. But they are awesome bud.
I replaced my Proxes with Kumho Ecsta PA51. They feel more comfy, but feel like they have a bit more road noise.
I gave up and replaced them all at 12K miles after the second blowout. Plus they ride and handle so much better than those shitty Turanzas.
I've noticed that tires go fairly quick on my Mazda3
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