Join Date: Nov 2016
Location: Pacific Northwest
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True that direct injection motors (and sorry I do not know whether yours is that), do result in significantly less underside cleaning of valve carbon deposits. Deposits in DI motors slowly build up over time on the underside of the valves and that many claim that periodic Seafoam and/or walnut shell cleaning helps remove those deposits. I know that Audi and some many other brands will sell you such "clean up" services (average pricing varies tremendously; some dealers will do this for $150). However, others dispute that such dealer cleaning is more than very marginally effective.
Have you noticed any diminished performance, for most agree that if there is significant underside valve carbon deposit build up, that that will reduce performance by a small to moderate amount?
The only other fact we know is that independent studies have confirmed that Top Tier gasoline does have extra additives that reduce those carbon build ups. In fact the latest AAA study showed that Top Tier gas reduces carbon valve build up by an average of 19%. (I only use Top Tier gas in my cars.)
Sorry I have not more definitely been able to answer your question, but if you are not feeling any diminished performance and such valve cleaning is not listed in your Owners Manual, you might not need to do anything at this time.
I am interested in soon reading others' posts below...
2017 Mazda 3 GT hatch: Soul Red Metallic with Black interior, manual: Premium Equipment pkg, customized OEM Appearance Pkg; iActivSense Pkg, add'l OEM options.
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