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2009 Mazda cx-7 oil sludge/buildup

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Topfli8979
New User

Jan 24, 2018, 8:07 PM

Post #1 of 5 (3025 views)
2009 Mazda cx-7 oil sludge/buildup Sign In
I'm in the process of changing out the timing chain on a new to me suv. Prior owner obviously didn't keep up with proper maintenance and oil changes. What's the best way for cleaning camshafts and upper engine valve area out? I see all these engine flushes, but I have heard horror stories about the after effects. Any advice?


Topfli8979
New User

Jan 24, 2018, 8:15 PM

Post #2 of 5 (3014 views)
Re: 2009 Mazda cx-7 oil sludge/buildup Sign In



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 24, 2018, 8:16 PM

Post #3 of 5 (3012 views)
Re: 2009 Mazda cx-7 oil sludge/buildup Sign In
There is no safe way to flush an engine. The safest thing to do is leave the sludge right where it is. Any sort of flush will loosen large chunks of sludge which will plug up vital passages and lead to engine failure.

A sludged up engine is basically a terminal problem for that engine. The only safe way to remove the sludge is complete disassembly and boil the block before rebuilding.

Just begin a schedule of very frequent oil changes and that will gradually remove it.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Jan 24, 2018, 8:18 PM)


Topfli8979
New User

Jan 24, 2018, 8:48 PM

Post #4 of 5 (3000 views)
Re: 2009 Mazda cx-7 oil sludge/buildup Sign In
Not what I wanted to hear,but was leaning toward a engine flush. Will stay away. Thanks for the info. Will find some high detergent oil for the changes from here on out.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 24, 2018, 9:06 PM

Post #5 of 5 (2991 views)
Re: 2009 Mazda cx-7 oil sludge/buildup Sign In
All oil is high detergent with very few exceptions. You don't have to look for anything special.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.






 
 
 






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