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Re: Cleaning sludgy nissan VQ [Re: MarcS] #4252991 11/19/16 03:32 PM
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krismoriah72 Offline
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I hope you got a heck of a deal on this car.

I would suspect that you will have carbon on the rings and all kinds of fun in the upcoming miles.

If it were mine by looking at the pictures i would try to get out of it...or invest in an extended warranty.

Re: Cleaning sludgy nissan VQ [Re: vitez] #4252992 11/19/16 03:32 PM
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MarcS Offline OP
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Originally Posted By: vitez
The Amsoil product is a detergent, not a solvent, and extremely unlikely to break off big chunks of anything.


Granted, my HazMat certs expired years ago, but the ingredients certainly read like a laundry list of organic solvents. Not saying that makes it dangerous to use in a lot of circumstances, I'm just concerned about what it doesnt completely liquify and wash out in a legitimately dirty engine.

Last edited by MarcS; 11/19/16 03:35 PM.
Re: Cleaning sludgy nissan VQ [Re: krismoriah72] #4252995 11/19/16 03:34 PM
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MarcS Offline OP
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Originally Posted By: krismoriah72
I hope you got a heck of a deal on this car.

I would suspect that you will have carbon on the rings and all kinds of fun in the upcoming miles.

If it were mine by looking at the pictures i would try to get out of it...or invest in an extended warranty.



I've had the compression checked and it's perfect in all cylinders.

Extended warranties are no help to me. I put on too many miles to get any value from them

Last edited by MarcS; 11/19/16 03:42 PM.
Re: Cleaning sludgy nissan VQ [Re: MarcS] #4252996 11/19/16 03:37 PM
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Brybo86 Offline
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Did the dealer who sold it to you disclose the lack of oil changes? If they knew I'm sure the former lessee/owner paid bigtime . Then the dealer goes and sells it as mint condition..... I would be livid!
Hopefully you got a steal on it...


12 Honda Odyssey 112k
09 Kymco Super8
08 Honda Accord 2.4L 164k
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Re: Cleaning sludgy nissan VQ [Re: Brybo86] #4253006 11/19/16 03:47 PM
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MarcS Offline OP
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Originally Posted By: Brybo86
Did the dealer who sold it to you disclose the lack of oil changes? If they knew I'm sure the former lessee/owner paid bigtime . Then the dealer goes and sells it as mint condition..... I would be livid!
Hopefully you got a steal on it...


Got a good deal, but its a used car dealer. Caveat emptor. My problem now.

Re: Cleaning sludgy nissan VQ [Re: MarcS] #4253034 11/19/16 04:32 PM
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donnyj08 Offline
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If you love it just change it every 4K miles on that engine. If you don't "love" the car you could always sell it.


2008 Silverado LT Z71 99k PP 10w30
2016 Tucson Limited 1.6T AWD 32k M1 5w30 AP
2016 Yamaha XSR900 13k, Spectro 10w40, Yamaha Filter.
Re: Cleaning sludgy nissan VQ [Re: MarcS] #4253121 11/19/16 06:52 PM
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MolaKule Offline
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You might try the LC20 by LCD as it slowly softens sludge and disperses it into the oil.

The plus here is that the sludge has a tarry form and is not baked.

Last edited by MolaKule; 11/19/16 06:53 PM.

Charlie Eppes: "Larry, have a minute?"
Dr. Larry Fleinhardt: "Yes. Because we all have exactly the same number of minutes at all times, do we not?" From NUMB3RS
Re: Cleaning sludgy nissan VQ [Re: MolaKule] #4253218 11/19/16 08:44 PM
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MarcS Offline OP
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Originally Posted By: MolaKule
You might try the LC20 by LCD as it slowly softens sludge and disperses it into the oil.

The plus here is that the sludge has a tarry form and is not baked.


How much and for how long for the amount of sludge in there?

Re: Cleaning sludgy nissan VQ [Re: MarcS] #4253229 11/19/16 08:55 PM
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bbhero Online Content
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I wasn't trying to give you a hard time at all with my response. I apologize if it seemed that way.
I do think it is not the best design as far as the motor oil capacity goes. Too small of a capacity for a motor like that. My Ford Fusion had 5.5 qts for a 3.0L. The longest I've gone with a interval was 6800 miles on old Pennzoil Ultra.
I hope you can get this all straightened out and that it will be a good circumstance going forward. I hope you continue to get a lot of good help in this forum. There are a decent number good knowledgeable people on here.


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"Treat your family like your friends and treat your friends like your family."
Re: Cleaning sludgy nissan VQ [Re: bbhero] #4253245 11/19/16 09:17 PM
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MarcS Offline OP
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Not at all. Guys who track them usually use deeper pans and oil coolers

Re: Cleaning sludgy nissan VQ [Re: MarcS] #4253318 11/20/16 03:09 AM
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I would not be concerned about using an idle flush additive in a heavily sludged engine, BUT I would be careful about using a drive around flush like MMO. Liqui Moly who make a variety of flush additives do warn not to use their drive around flush in a heavily sludged engine unless the sump and oil pump intake are cleaned first. They also warn that you should keep the revs low when in use. There are no warnings about the use of their idle flush.

Doing a few short OCI's with a good cleaner oil (One with a lot of detergents) will shift the sludge, BUT it takes a long time to remove top end varnish, so unless you intend doing a full manual clean up (Big messy job), I would use an idle flush.

Re: Cleaning sludgy nissan VQ [Re: MarcS] #4253329 11/20/16 04:12 AM
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Garak Offline
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There's lots of good advice here. I always err on the side of caution. I am cautious about idle flushes. That's not to say there is no use for them. However, I use an idle flush (or any aggressive flushing product) if and only if I am prepared to immediately pull the engine and tear it down to fix any problems that might arise subsequently. I used a strong flush in the old F-150. But, it was being torn down anyhow, so no matter what damage could hypothetically be caused would be rather irrelevant.

I'd be using shortish oil changes for the time being, and Mola always offers good advice. If he recommends a product, it's just about guaranteed to be safe.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: Cleaning sludgy nissan VQ [Re: MarcS] #4254246 11/21/16 08:51 AM
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Were it my vehicle, I'd use HDEO 15W40 for two 2,000 mile OCs.

Good luck!


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1937 Alvis Speed 25 20W50 w LM MoS2 & LM MOS
1970 VW Peking - Paris Rally Beetle HDEO 15W40 w LM MoS2
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Re: Cleaning sludgy nissan VQ [Re: vintageant] #4254435 11/21/16 01:37 PM
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MarcS Offline OP
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Originally Posted By: vintageant
Were it my vehicle, I'd use HDEO 15W40 for two 2,000 mile OCs.

Good luck!


I'm not sure that such a heavy weight oil in winter would play nice with the complicated valvetrain in this car.

Re: Cleaning sludgy nissan VQ [Re: MarcS] #4254511 11/21/16 03:14 PM
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Originally Posted By: MarcS
Originally Posted By: MolaKule
You might try the LC20 by LCD as it slowly softens sludge and disperses it into the oil.

The plus here is that the sludge has a tarry form and is not baked.


How much and for how long for the amount of sludge in there?


As you know I don' usually recommend OTC additives unless I know there is a specific product that may work for a very specific problem.

In this case, "slow and easy" does it.


I would use two ounces per quart of LC20 initially after an oil change, and then later use one ounce per quart after each oil change until the sludge is removed.

And one other item should be in the forefront, and that is to change filters every 1000 miles while using any engine cleaner.

Last edited by MolaKule; 11/21/16 03:27 PM.

Charlie Eppes: "Larry, have a minute?"
Dr. Larry Fleinhardt: "Yes. Because we all have exactly the same number of minutes at all times, do we not?" From NUMB3RS
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