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I work for my local Mazda dealer and I can say I never put 5w20 in when I do an oil change, always 5w30. You shouldnt have a problem if your using thicker oil. I would recommend Castrol conventional oil.
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1985 Mazda RX7 GSL 13B, Holley etc
1997 Mazda MX6 LS - DD lowered on 17s
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