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#4540972 - 10/12/17 08:23 AM Have you ever used a motor flush? Which one?
ZZman Offline


Registered: 03/17/08
Posts: 5036
Loc: Michigan
I have many times but it was a long time ago before I started using Syn oil in my vehicles.
I used Gunk Motor Flush.
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2003 Mercury Grand Marquis. Castrol Edge High Mileage oil
2008 Sebring Hardtop convertible. PP High Mileage oil
2006 Kawasaki Vulcan 900 LT

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#4540983 - 10/12/17 08:35 AM Re: Have you ever used a motor flush? Which one? [Re: ZZman]
skyactiv Offline


Registered: 03/02/13
Posts: 3726
Loc: The Midwest
The old fashioned ones are nothing but kerosene. Brand doesn't matter.
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#4540998 - 10/12/17 08:49 AM Re: Have you ever used a motor flush? Which one? [Re: skyactiv]
ZZman Offline


Registered: 03/17/08
Posts: 5036
Loc: Michigan
Originally Posted By: skyactiv
The old fashioned ones are nothing but kerosene. Brand doesn't matter.


Have you ever used one?
_________________________
2003 Mercury Grand Marquis. Castrol Edge High Mileage oil
2008 Sebring Hardtop convertible. PP High Mileage oil
2006 Kawasaki Vulcan 900 LT

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#4541000 - 10/12/17 08:52 AM Re: Have you ever used a motor flush? Which one? [Re: ZZman]
kschachn Offline


Registered: 12/26/05
Posts: 8738
Loc: Upper Midwest
Originally Posted By: ZZman
Originally Posted By: skyactiv
The old fashioned ones are nothing but kerosene. Brand doesn't matter.

Have you ever used one?

What would that have to do with anything? Are they just kerosene?
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1994 BMW 530i, 222K
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#4541014 - 10/12/17 09:08 AM Re: Have you ever used a motor flush? Which one? [Re: ZZman]
IndyIan Offline


Registered: 09/23/08
Posts: 8595
Loc: Ontario, Canada
My Focus had one done at 20k miles before I got it... I guess the previous owner went over a year before getting an oil change(she didn't drive very much) at jiffy lube and was talked into it! I also found ATF in the transmission so all Jiffy Lube was doing was costing her money and actually shortening the life of the car...
I never have or will use a motor flush myself.
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#4541028 - 10/12/17 09:27 AM Re: Have you ever used a motor flush? Which one? [Re: ZZman]
LeakySeals Offline


Registered: 02/18/11
Posts: 6343
Loc: Hudson, NH
I used Gunk as well back in the 90's. I didn't perform a teardown after, but the stick was jet black, and there was weird stuff in the pan. Not chunks, what looked like mud, sand, chocolate syrup. Then I tried it again. was much cleaner, oil consumption was cut in half. So IMO it works on poorly maintained engines.
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#4541029 - 10/12/17 09:28 AM Re: Have you ever used a motor flush? Which one? [Re: IndyIan]
khittner Offline


Registered: 07/13/12
Posts: 200
Loc: Michigan
I've used both the Amsoil engine flush and Kreen (as a piston soak) in my '02 Toyota Camry's 2AZ-FE engine. The engine has 264K miles on it, and it began using a quart of oil every 900-1200 miles, depending on viscosity starting at about 230K. I originally thought that I simply have the sticking rings/too-small return holes problem that is fairly common to these engines, and perhaps I do, but neither of these products, used as directed, resulted in any obvious "de-gunking" of the engine (rings, lands, or anywhere else) and has made no noticeable impact on the oil consumption. Perhaps this lack of efficacy of the engine flush products should've been expected; the car has had a pretty steady diet of good full-synthetic oil for the past 8 years/150K miles. I've had a leak-down compression test done on the engine by my usual independent mechanics' shop, and the engine has compression in all cylinders within 5% of a new spec, so I'm thinking now that the oil is coming in through worn valve guides, rather than past stuck or worn piston rings.


Edited by khittner (10/12/17 09:32 AM)

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#4541042 - 10/12/17 09:40 AM Re: Have you ever used a motor flush? Which one? [Re: khittner]
LeakySeals Offline


Registered: 02/18/11
Posts: 6343
Loc: Hudson, NH
Originally Posted By: khittner
I've used both the Amsoil engine flush and Kreen (as a piston soak) in my '02 Toyota Camry's 2AZ-FE engine. The engine has 264K miles on it, and it began using a quart of oil every 900-1200 miles, depending on viscosity starting at about 230K. I originally thought that I simply have the sticking rings/too-small return holes problem that is fairly common to these engines, and perhaps I do, but neither of these products, used as directed, resulted in any obvious "de-gunking" of the engine (rings, lands, or anywhere else) and has made no noticeable impact on the oil consumption. I've had a leak-down compression test done on the engine by my usual independent mechanics' shop, and the engine has compression in all cylinders within 5% of a new spec, so I'm thinking now that the oil is coming in through the valve guides, rather than past stuck or worn piston rings.

I'm quite familiar with that year 2AZ-FE. My 02 Camry lasted to 354k burning oil. IMO its a little of both. Clogged piston oil return holes, leaking valve seals. Nothing will unclog those holes short of a teardown and a drill. So if its just clogged piston oil return holes, a thicker oil will help. If its valve seals, you will definitely benefit from a HM oil with conditioners/swellers. You will see blue smoke at startup after sitting overnight, or for a couple days. Have someone start your car so you can watch the tailpipe. Very important on these engines, change the coolant. often. Its directly related to oil related issues (hot spots frying oil) , and potentially fatal flaw where the head bolts could randomly separate from the aluminum block. Best luck with oil I had was M1 10w30. Great cleaner, did a fantastic job with the valve seals.
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06 Escalade 6.0L AWD 155k. M1 EP 5w30 Fram TG
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#4541091 - 10/12/17 11:04 AM Re: Have you ever used a motor flush? Which one? [Re: ZZman]
Nickdfresh Offline


Registered: 03/15/06
Posts: 5599
Loc: Buffalo, NY
No. Heard to many horror stories of it causing more problems than it fixed...

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#4541105 - 10/12/17 11:30 AM Re: Have you ever used a motor flush? Which one? [Re: ZZman]
skyactiv Offline


Registered: 03/02/13
Posts: 3726
Loc: The Midwest
Originally Posted By: ZZman
Originally Posted By: skyactiv
The old fashioned ones are nothing but kerosene. Brand doesn't matter.


Have you ever used one?


Yes, on an engine I rebuilt. The inside of the engine was very clean. I didn't know the service history of the car and don't know the effect it had.
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#4541113 - 10/12/17 11:48 AM Re: Have you ever used a motor flush? Which one? [Re: ZZman]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 624
Loc: Canada



Instead of buying a brand name engine flush with kerosene in it and pay $10 a bottle,
I buy a bottle of kerosene for $3! I get 4 flushes out of it over 5 yrs!

I found out about this trick from a trucker pal o/o in the '80s who looked after his own
truck, if he can do it, I could too.

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#4541155 - 10/12/17 12:47 PM Re: Have you ever used a motor flush? Which one? [Re: ZZman]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
My Dad ruined the engine in his Cadillac with a motor oil flush. He drove the car a little ways and then the engine seized up. Tow truck came and got the car and took it to a repair shop. The engine was pulled, disassembled and sent to the machine shop. He kept the car for another 20 years after that.

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#4541190 - 10/12/17 01:27 PM Re: Have you ever used a motor flush? Which one? [Re: ZZman]
Superflan Offline


Registered: 04/28/15
Posts: 253
Loc: Reunion Island
Used the cheapest i could find when I « needed » it, when buying used vehicles and doing the first oil change myself.. Instructions were always like « pour the bottle in the engine oil fill when at operating temperature, then let idle 15 minutes. DO NOT DRIVE »

The greatest improvement was on a 2LT Toyota engine.

I even ran straight gasoil (after flushing oil) for less than 5 seconds in a push mower briggs and stratton classic 35 engine, 10 years ago. The engine still runs like new today, with high torque demand, seeing many decks pass by...
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Yaris 1.0 195mkm 10W40 A3/B4 SL/CF
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#4541266 - 10/12/17 02:44 PM Re: Have you ever used a motor flush? Which one? [Re: ZZman]
panthermike Offline


Registered: 04/01/08
Posts: 3343
Loc: Phoenix, AZ
The only marketed flush I've used was lubegard flush. It seemed gentler from their description than others but did do some cleaning from what I could tell. I would use it again if I ever felt I needed it.
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'16 Ram Sport 1500; Havoline/Biotech, Wix 21K
'10 Impala; PHM/ Biotech, MG 111K
'70 F100; Valvoline 15w40/Biotech, Motorcraft


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#4541318 - 10/12/17 03:54 PM Re: Have you ever used a motor flush? Which one? [Re: ZZman]
JC1 Offline


Registered: 11/29/08
Posts: 2564
Loc: Oshawa, Ontario Canada
Originally Posted By: ZZman
I have many times but it was a long time ago before I started using Syn oil in my vehicles.
I used Gunk Motor Flush.


I've used gunk before (over 8 years ago). I didn't see a
difference in performance on a v6 Toyota.

I agree that the kerosene method is cheaper and maybe even more effective.
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1997 Honda Civic CX 5w-30 PPPP/Mahle Filter

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