How To Reduce Carbon Build-Up On Intake Valves - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 12 (permalink) Old 08-07-2018, 10:59 PM Thread Starter
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How To Reduce Carbon Build-Up On Intake Valves

1. Install a Catch-Can: Our engines already have an oil separator part of the PCV valve, but installing a catch-can will help prolong the duration driven until you need to clean your intake valves.

2. Use 5W30 Oil: Now I'm really trying not to start another oil war, but according to Chris_Top_Her (a moderator over at Mazdas247) in this quoted post here, he noted his catch-can caught significantly less blow-by when using 5w30 oil:

Quote:
Originally Posted by Chris_Top_Her View Post
I got about 50-75ml when I changed my oil plus some that spilled out when I took the cap off the hose. That's after about 7000 miles which is the longest interval I've done this far. It's also the least amount of catch I've drained since I've had the can. I drained out 5w30. The previous times I've changed my oil was usually around 5k, with OEM 0w20 moly and it produced way more catch and also the oil was always pitch black compared to the 5w30 I used for a longer period. Seems like the 5w30 is better at reducing blowby however this time I added 0w20 (not OEM).
3. Driving Habits, Driving Style: Mazda has done research to try and reduce the amount of carbon build-up on the intake valves and noted that when the intake valve temperatures fall below 400F, carbon build-up is more prone to occur. This means two things: 1. Doing lots of short distance driving and not allowing your engine to fully come up to temp is not good for several reasons, but mainly it keeps the engine below this temperature threshold, allowing carbon buildup to form. 2. While the Italian tune-up is said not to do much for DI engines because fuel does not pass through the intake valves, revving your engine to redline and using fuel system cleaner on a regular basis will increase temperatures within the combustion chamber, thus reducing the amount of carbon build-up you will experience on your intake valves. This, along with regular highway driving should ensure your motor stays nice and healthy. According to some threads I have read over at Mazdas247, carbon build-up with the SKYACTIV engine seems to vary on a case-by-case basis, likely depending on your driving style and perhaps some other factors such as ambient temperature, oil change intervals, etc. But if you notice that the engine has become rougher during idle and acceleration, or performance/efficiency is not quite as good as earlier on in the cars life, these factors are major giveaways that your intake valves need to be cleaned.

Last edited by Get Inline; 08-07-2018 at 11:09 PM.
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post #2 of 12 (permalink) Old 08-08-2018, 11:30 AM Thread Starter
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@tickerguy, what do you think?
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post #3 of 12 (permalink) Old 08-11-2018, 09:13 PM Thread Starter
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anyone? thought this would have started some good conversation..
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post #4 of 12 (permalink) Old 08-11-2018, 11:15 PM
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Umm...

No.

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post #5 of 12 (permalink) Old 08-11-2018, 11:24 PM Thread Starter
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Umm...

No.
No what? What are you talking about?
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post #6 of 12 (permalink) Old 08-12-2018, 09:25 PM
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Quote:
Originally Posted by Get Inline View Post
No what? What are you talking about?
Nobody cares about your posts.

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post #7 of 12 (permalink) Old 08-12-2018, 09:26 PM Thread Starter
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Quote:
Originally Posted by dave in edmonds View Post
Quote:
Originally Posted by Get Inline View Post
No what? What are you talking about?
Nobody cares about your posts.
Thanks for speaking on the behalf of this whole forum?
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post #8 of 12 (permalink) Old 08-12-2018, 09:45 PM
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Please now, folks. Good, cogent statements are always welcome, particularly when a modicum of humility is evident. All points of view are beneficial to this group.

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post #9 of 12 (permalink) Old 08-13-2018, 12:39 AM Thread Starter
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Please now, folks. Good, cogent statements are always welcome, particularly when a modicum of humility is evident. All points of view are beneficial to this group.
Apparently "Uhmm... No." Is cogent enough for this guy?

I thought I made a pretty decent post in regards to a known issue with DI motors. The Skyactiv motor doesn't seem to have many instances of carbon build-up, but it's not entirely unheard of. Some coherent responses other than yours would certainly be nice.
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post #10 of 12 (permalink) Old 08-13-2018, 01:08 AM
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Does the SkyActiv motor have any instances of carbon build-up? I thought Mazda engineered a way to minimize this issue. In all of my years here, I've never heard of carbon build-up being an issue with these engines.
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