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Don't I need to stay with 0W-20 for warranty reasons?

I'm in the United States, so our only option is the 2.5 liter unfortunately.

Blackstone report for my Mazda 6. Bought it new, broke it in right, and am very happy with these results! The previous fill was MGMO 0w20, but I see no need to use that more expensive oil with these kinds of results from the AFE. I plan to do one more UOA on my current AFE fill to make sure its...

Just to chime in my two cents. I just did a UOA for my 2014 Mazda 6 with a manual transmission. It has ~28K miles in it now and I regularly toodle around town at 1200 RPMs in 6th gear (around 35 mph), and I always do about 1000 rpms in parking lots and school zones in 2nd gear. Blackstone said...