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Originally Posted by Pr3cise
I run an 04 mazda3 with full headers, straight exhaust, intake, computer work, and too much to list... I've taken apart 4 cyl engine blocks... some places you get gas from is just shitty. Cheveron Silver is good, clear as water. Mobile is good too.
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Did you change the compression on the engine by changing out anything internal?
If not you can run 87 no problem....