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#4633333 - 01/13/18 08:38 AM Re: Sludge remediation regimen: Toyota 3MZ-FE V6 [Re: coastsider]
dlundblad Offline


Registered: 09/30/13
Posts: 9133
Loc: Midwest
Concern about crud or moisture buildup on or around fill caps as well as dipstick tubes isn't a huge concern. The areas are never allowed to get hot and the majority of the threads are posted during the winter months.

I've been worried about it before too.
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#4633347 - 01/13/18 08:49 AM Re: Sludge remediation regimen: Toyota 3MZ-FE V6 [Re: coastsider]
alarmguy Offline


Registered: 07/10/12
Posts: 1849
Loc: South Carolina
You have a good truck, would not be concerned with what you scrapped off with your finger.

With that said, yes, without question simply run an HEDO, change it every 4000 miles or so or 3 times a year (or check the manual for severe usage) depending of course it it will be a higher mileage highway vehicle (easy on the engine) or local low mileage vehicle (rough on an engine) - of course as you know, warmer climate makes it even more easy on the engine.

Personally I would not use a synthetic HDEO but thats up to you, my first preference is always conventional HDEO.


Edited by alarmguy (01/13/18 08:50 AM)
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#4633664 - 01/13/18 01:35 PM Re: Sludge remediation regimen: Toyota 3MZ-FE V6 [Re: FlyNavyP3]
Trav Offline


Registered: 11/20/06
Posts: 16920
Loc: MA, Mittelfranken.de
Originally Posted By: FlyNavyP3
Originally Posted By: Trav
That engine has a crusty looking black baffle under the fill cap. If you want to know how it really looks pull a valve cover (no need to pull both just the easiest one) then you will know if you are dealing with any sort of buildup or a clean engine.
I wouldn't go much more than 3-4K OCI on these bad boys though depending on their use.


Concur with the baffle but disagree with the OCI length, I've had 1-3 ppm iron and aluminum as far out as 10,000 miles on UOA in the exact same engine. Everything from conventional to top shelf Synthetic, no difference, everything from 5w20 to SAE 30 to 20w50 no change. This engine isn't hard on oil in my experience.


Your probably right given your and the OP's location/climate. Up here in the north east with a lot of stop and go and short trips the 3.0 Toyota has a known issue for sludge even after they extended the warranty and supposedly took care of the problem.
Toyota themselves recommended 3K OCI and IIRC synthetic oil in the warranty extension letter I got some years ago.
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#4634629 - 01/14/18 12:18 PM Re: Sludge remediation regimen: Toyota 3MZ-FE V6 [Re: Trav]
kschachn Online   content


Registered: 12/26/05
Posts: 8719
Loc: Upper Midwest
Originally Posted By: Trav
Your probably right given your and the OP's location/climate. Up here in the north east with a lot of stop and go and short trips the 3.0 Toyota has a known issue for sludge even after they extended the warranty and supposedly took care of the problem.
Toyota themselves recommended 3K OCI and IIRC synthetic oil in the warranty extension letter I got some years ago.

Ture, but this is the 3.3L 3MZ-FE.
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#4634683 - 01/14/18 01:22 PM Re: Sludge remediation regimen: Toyota 3MZ-FE V6 [Re: coastsider]
KL31 Offline


Registered: 06/03/16
Posts: 511
Loc: South OZ
Same engine here in a highlander and yes that's just how the filler hole looks.

Run the havoline if you have plenty. Absolutely no need to fork out money for something that will "clean" better because it won't clean much better and there's 99% nothing to clean if the engine has full service history. Just enjoy the car and maintain it best you can.
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