Mazda CX-9 This larger SUV adds a V6 option, as well as more cargo room, to the CX-7 option.

2018 CX-9 Oil and Oil Filter Choices

Old 09-29-2018, 08:47 AM
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Default 2018 CX-9 Oil and Oil Filter Choices

Hi guys,

I tried searching this forum for this topic and got nothing. We purchased the CX-9 a few days ago and love it. I have had two RX-7s over the years and still have my 1993 RX-7 R1. Trying to decide what oil that I am going to be using in the CX-9. What oil filter and oil seems to be the most popular. Once I get this thing completely broke in I will switch it over to synthetic. I see the manual states that Castrol is the "official" oil.

Thanks in advance.

Wayne Mann
Old 09-29-2018, 10:51 AM
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Oil and filters are like religion, use whichever you want (assuming they meet the grade specifications set forth by Mazda); it won't make any difference in how long your engine lasts.
Old 09-29-2018, 05:54 PM
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Thanks Shipo,

It is just nice to hear what other are using.

Wayne Mann
Old 10-01-2018, 02:15 AM
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Use genuine filters, & the oil specified in your owner's manual.
Old 10-02-2018, 11:36 AM
Join Date: Jun 2016
Location: Washington, the state
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There is never a consensus on oil brands or types, nor on filters.

You can use synthetic oil today. There is no need to wait. In any case, Mazda says you can use any 5W-30 oil that meets the current API Service Category, SN, and newer categories that will be developed, and ILSAC standard GF-5 and newer standards that come along. I use synthetic Castrol Edge--(a) I drive in both frigid winter conditions and very hot summer conditions so full syn might be a benefit, (b) the local auto parts store had a great sale on Castrol Edge, so I bought a case. Castrol is nothing special--excellent as are many other excellent top-brand oils. The fact that Castrol paid Mazda to put their brand in the manual means nothing to me.

I use Mazda filters. There are no industry standards for filters like there are for oils. The engine maker does not publish the filter specs, so filter makers reverse engineer the OEM filters. Some filter makers do a great job. Some filter makers pick one out of their catalog that seems to be close enough. In the very rare possibility of an oil-lubricated engine failure, I want that OEM filter on there for warranty protection. I change my own oil & filter.
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