Mazda Skyactiv Carbon Buildup...

[bustednutz]

You may also want to google Chrysler rust problem, Ford rust problem, GM rust problem, Honda, Toyota, Nissan, etc......

If you live in the rustbelt.........guess what.....its called that for a reason.

 

[KrisZ]

Well, I see quite a few Mazda 3's Almost on daily basis with visible rust in the rear fender lips and third brake light that is on the trunk lid. SLCraig may generalize too much about all Mazdas, but the first gen Mazda3 definitely has a problem, but that doesn't say anything about the current gen.
Mine is rust free, but every year it is oil sprayed.

 

[mechtech2]

Originally Posted By: Eddie
I run a 2007 MAZDA CX7 DI turbo engine and I have 60,000 trouble free miles. Early engines had PCV problems which caused intake valve buildup. Later engines had no problems. I would not worry about later DI engines as Mazda and most manufactures have solved the valve problem years ago. Ed


Wrong. Neither they nor others have solved anything. They have addressed the issue, and some have attenuated it to a degree.
Good oil does seem to help a bit. Extra upstream injectors can help, but then why bother with the DI system?
The car will run pretty good for a LONG time, but build up is inevitable, and some performance/breathing is diminished.
No solution is here yet with DI engines.

 

[Jamis]

Originally Posted By: mechtech2
Wrong. Neither they nor others have solved anything. They have addressed the issue, and some have attenuated it to a degree.
Good oil does seem to help a bit. Extra upstream injectors can help, but then why bother with the DI system?
The car will run pretty good for a LONG time, but build up is inevitable, and some performance/breathing is diminished.
No solution is here yet with DI engines.


I'll buy this explanation, based on what I've read everywhere else so far. Now, define "a LONG time". Is it a 100K miles, 150K miles, or a lot less? My '03 P5 has 75K miles on it. It still beats the EPA mileage estimates, uses no oil between 10K mile oil changes, and has had Mobil1 in the engine since new. Can I reasonably expect that of the DI Skyactiv motor also?

 

[artificialist]

The reason the engine may have 12:1, 13:1, or 14:1 is because different variants go into different applications:
USA Mazda 3 12:1 87 octane gas
USA Mazda CX-5 13:1 87 Octane gas
European versions get 14:1 compression because people almost always use more than 87 octane gas.

Anyway, I am not sure how prone to deposits the intakes are. How bad were the Mazdaspeed 3 and Mazdaspeed 6? Those are the only other GDI Mazda engines I can think of.

 

[Jamis]

Originally Posted By: artificialist
The reason the engine may have 12:1, 13:1, or 14:1 is because different variants go into different applications:
USA Mazda 3 12:1 87 octane gas
USA Mazda CX-5 13:1 87 Octane gas
European versions get 14:1 compression because people almost always use more than 87 octane gas.

Anyway, I am not sure how prone to deposits the intakes are. How bad were the Mazdaspeed 3 and Mazdaspeed 6? Those are the only other GDI Mazda engines I can think of.


Thanks for the explanation of the CRs. I didn't realize the Speed3 and Speed6 were DI engines. I haven't seen anyone commenting on carbon build on those engines. Perhaps, I'm being over cautious on the subject. I do have a note off to Mazda on the subject also.