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#4719538 - 04/07/18 02:09 PM Skyactiv Intake Valve Deposits
buster Offline


Registered: 11/16/02
Posts: 30481
Loc: NJ
I haven't paid much attention to whether the Skyactiv engines are prone to intake valve deposits. I've heard many say they are, and even noticed the BG service offered by the dealerships, but I've yet to actually see proof there is an issue with the Skyactiv engines.

I've used M1 and top tier gas in my car and it runs like it did when I first bought it. The car has 51,400 miles on it.

Mazda claims to have solved this issue. I'm not on any of the Mazda forums to get a better sense of the reality of the situation.

http://www.motoiq.com/MagazineArticles/I...Technology.aspx
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#4719555 - 04/07/18 02:21 PM Re: Skyactiv Intake Valve Deposits [Re: buster]
RamFan Offline


Registered: 05/09/10
Posts: 1984
Loc: Illinois, U.S.A
I've owned two, 2.5l SkyActiv engines. Neither have had deposit issues. I frequent Mazdas247 and have not seen reports of deposits. It seems as though Mazda solved the issue for their engines, but, most other manufacturers have also.
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#4719556 - 04/07/18 02:22 PM Re: Skyactiv Intake Valve Deposits [Re: buster]
dave123 Offline


Registered: 01/13/09
Posts: 2336
Loc: wi
110 thousand miles on my skyactiv runs like day I bought it 5k with mobil1 nothing else special done. Absolutely love theat engine 2.0l

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#4719557 - 04/07/18 02:22 PM Re: Skyactiv Intake Valve Deposits [Re: buster]
PimTac Offline


Registered: 03/04/17
Posts: 4584
Loc: Soviet State of Washington
It seems that Mazda has taken steps to reduce buildups and fuel dilution. I havenít heard of major issues with their engines like the other manufacturers have. The linked article is from 2011 so a lot of changes have occurred along the way. Starting with 2017 the engines had redesigned pistons and rings plus offset crankshaft.
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#4719559 - 04/07/18 02:23 PM Re: Skyactiv Intake Valve Deposits [Re: buster]
bdcardinal Online   content


Registered: 06/03/05
Posts: 11068
Loc: Santa Barbara, CA
I haven't noticed anything with any cars that come through service.
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Opinions expressed are my own.

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#4719601 - 04/07/18 03:12 PM Re: Skyactiv Intake Valve Deposits [Re: buster]
Mr Nice Offline


Registered: 09/12/04
Posts: 21325
Loc: Orlando, FL
Iím in the market to buy a new Mazda 3 hatchback, I was wondering about DI deposits...


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#4719606 - 04/07/18 03:20 PM Re: Skyactiv Intake Valve Deposits [Re: buster]
webfors Offline


Registered: 06/06/06
Posts: 4955
Loc: Great White North.. eh
One way to find out for sure. Grab your wrench and camera!
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#4719798 - 04/07/18 06:22 PM Re: Skyactiv Intake Valve Deposits [Re: buster]
Marco620 Offline


Registered: 02/25/14
Posts: 2215
Loc: Kansan,Heckler Koch fan
Use toptier fuel, synthetic oil and a regiment of CRC GDI throttle cleaner and Gumout all in One. No to Techron; its PEA based but lacks a friction modifier and does nothing for ethanol protection.
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#4719885 - 04/07/18 07:49 PM Re: Skyactiv Intake Valve Deposits [Re: buster]
FordBroncoVWJeta Offline


Registered: 04/16/16
Posts: 786
Loc: KS
Usually of all the cars I had come through Walmart, the only ones that I can tell that have fuel dilution issues is Honda. I haven't messed with that many Honda's, but the ones that always smell like gas in the oil are the 2015-16 2.4 engines from Honda. I havent dealt with any of the other new Honda engines though. Even the one in my signature smells like a gas tank in the crankcase.

My 17 Jetta also has DI, but it doesn't smell like a gas station. I guess Honda wasn't producing "Honda Quality" with those engines. shrug
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#4719931 - 04/07/18 08:25 PM Re: Skyactiv Intake Valve Deposits [Re: PimTac]
spasm3 Offline


Registered: 05/30/10
Posts: 8763
Loc: North Carolina
Originally Posted By: PimTac
It seems that Mazda has taken steps to reduce buildups and fuel dilution. I havenít heard of major issues with their engines like the other manufacturers have. The linked article is from 2011 so a lot of changes have occurred along the way. Starting with 2017 the engines had redesigned pistons and rings plus offset crankshaft.



Probably like you, i researched and did not find much in the way of intake valve issues with the skyactiv engines. Thats one of the reasons i went with mazda.

I'd more interested in fuel dilution that intake valve build up. Less data/info out there on fuel dilution.
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17 mazda cx-5 3900 miles m1 0w20/0w40 mix

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#4720125 - 04/08/18 03:10 AM Re: Skyactiv Intake Valve Deposits [Re: buster]
The Critic Offline


Registered: 08/30/04
Posts: 19877
Loc: CA
In theory, all DI engines will be prone to intake valve deposits. However, is being "managed" thru other techniques. If you are concerned about deposits, you will need to remove the intake manifold and inspect the intake valves using an inspection camera. Anything else is just a guess.
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2007 Honda Accord 2.4 - 129K - Idemitsu 5W-20

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#4720250 - 04/08/18 07:48 AM Re: Skyactiv Intake Valve Deposits [Re: buster]
Eddie Offline


Registered: 12/07/03
Posts: 9643
Loc: Florida, Cape Coral
Might be possible to rotate the engine so the intake valves are open and inspect through the spark plug hole? Ed
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#4721910 - 04/09/18 04:56 PM Re: Skyactiv Intake Valve Deposits [Re: buster]
buster Offline


Registered: 11/16/02
Posts: 30481
Loc: NJ
Thanks for the feedback. I will continue to not worry about this. grin
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#4722153 - 04/09/18 08:50 PM Re: Skyactiv Intake Valve Deposits [Re: buster]
benjy Offline


Registered: 08/23/10
Posts: 901
Loc: pa
hoping for my GF's sake her DI 2.5L 2013 Malibu continues to be carbon free, 50,xxx miles + ONLY a new radiator SO FAR!!!

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#4813313 - 07/13/18 03:33 PM Re: Skyactiv Intake Valve Deposits [Re: buster]
Mr Nice Offline


Registered: 09/12/04
Posts: 21325
Loc: Orlando, FL
I'm guessing an Italian tune up won't help.

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