You should stick with 5w20, the 30 is *okay* but the engine is designed around the 20 weight. Does your engine use a cartridge filter or conventional? Have you tried a Mazda dealership for the filter? For my cars I go to Toyota and buy them in a case of 10, it works out to about $6/filter.
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Originally Posted by GoinAllTheWay
05 Mazda 3 GT with just over 100k on it.
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