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Have you ever used a motor flush? Which one? #4540972
10/12/17 07:23 AM
10/12/17 07:23 AM
Joined: Mar 2008
Posts: 6,133
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 6,133
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.


2003 Mercury Grand Marquis. PP HM 5w-30 and Fram Ultra
2008 Sebring Hardtop convertible. PP HM 5w-30 and Fram Ultra
2006 Kawasaki Vulcan 900 LT. Motul 7100 10w-40 and K&N
Re: Have you ever used a motor flush? Which one? [Re: ZZman] #4540983
10/12/17 07:35 AM
10/12/17 07:35 AM
Joined: Mar 2013
Posts: 5,030
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,030
The Midwest
The old fashioned ones are nothing but kerosene. Brand doesn't matter.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: Have you ever used a motor flush? Which one? [Re: skyactiv] #4540998
10/12/17 07:49 AM
10/12/17 07:49 AM
Joined: Mar 2008
Posts: 6,133
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 6,133
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. PP HM 5w-30 and Fram Ultra
2008 Sebring Hardtop convertible. PP HM 5w-30 and Fram Ultra
2006 Kawasaki Vulcan 900 LT. Motul 7100 10w-40 and K&N
Re: Have you ever used a motor flush? Which one? [Re: ZZman] #4541000
10/12/17 07:52 AM
10/12/17 07:52 AM
Joined: Dec 2005
Posts: 10,283
Upper Midwest
kschachn Online content
kschachn  Online Content
Joined: Dec 2005
Posts: 10,283
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?


1994 BMW 530i, 238K
1996 Honda Accord, 266K
1999 Toyota Sienna, 407K
2000 Toyota ECHO, 280K
Re: Have you ever used a motor flush? Which one? [Re: ZZman] #4541014
10/12/17 08:08 AM
10/12/17 08:08 AM
Joined: Sep 2008
Posts: 9,235
Ontario, Canada
IndyIan Offline
IndyIan  Offline
Joined: Sep 2008
Posts: 9,235
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.


07 Focus ZXW, 5spd manual, 218km M1 5W30
18 Outback 2.5 CVT 15km 0W20
Re: Have you ever used a motor flush? Which one? [Re: ZZman] #4541028
10/12/17 08:27 AM
10/12/17 08:27 AM
Joined: Feb 2011
Posts: 6,760
Hudson, NH
LeakySeals Offline
LeakySeals  Offline
Joined: Feb 2011
Posts: 6,760
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.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Have you ever used a motor flush? Which one? [Re: IndyIan] #4541029
10/12/17 08:28 AM
10/12/17 08:28 AM
Joined: Jul 2012
Posts: 397
Michigan
khittner Offline
khittner  Offline
Joined: Jul 2012
Posts: 397
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.

Last edited by khittner; 10/12/17 08:32 AM.
Re: Have you ever used a motor flush? Which one? [Re: khittner] #4541042
10/12/17 08:40 AM
10/12/17 08:40 AM
Joined: Feb 2011
Posts: 6,760
Hudson, NH
LeakySeals Offline
LeakySeals  Offline
Joined: Feb 2011
Posts: 6,760
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.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Have you ever used a motor flush? Which one? [Re: ZZman] #4541091
10/12/17 10:04 AM
10/12/17 10:04 AM
Joined: Mar 2006
Posts: 5,727
Buffalo, NY
Nickdfresh Offline
Nickdfresh  Offline
Joined: Mar 2006
Posts: 5,727
Buffalo, NY
No. Heard to many horror stories of it causing more problems than it fixed...

Re: Have you ever used a motor flush? Which one? [Re: ZZman] #4541105
10/12/17 10:30 AM
10/12/17 10:30 AM
Joined: Mar 2013
Posts: 5,030
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 5,030
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.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Wanted: 2019 Ford Ranger
Re: Have you ever used a motor flush? Which one? [Re: ZZman] #4541113
10/12/17 10:48 AM
10/12/17 10:48 AM
Joined: May 2016
Posts: 718
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 718
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.

Re: Have you ever used a motor flush? Which one? [Re: ZZman] #4541155
10/12/17 11:47 AM
10/12/17 11:47 AM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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.

Re: Have you ever used a motor flush? Which one? [Re: ZZman] #4541190
10/12/17 12:27 PM
10/12/17 12:27 PM
Joined: Apr 2015
Posts: 422
Reunion Island
Superflan Offline
Superflan  Offline
Joined: Apr 2015
Posts: 422
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...


Peugeot Partner 1.9 D, 5W40 C3, 245000 Km, running on WVO
Wife's Mitsubishi Outlander PHEV, dealer’s overfilled, 16000 Km
Re: Have you ever used a motor flush? Which one? [Re: ZZman] #4541266
10/12/17 01:44 PM
10/12/17 01:44 PM
Joined: Apr 2008
Posts: 3,360
Phoenix, AZ
panthermike Offline
panthermike  Offline
Joined: Apr 2008
Posts: 3,360
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.


'15 Lexus RX350; PP 0w20, 33K
'10 Impala; Frankenbrew, MG 114K
'70 F100; Valvoline 15w40/Biotech, Motorcraft

Re: Have you ever used a motor flush? Which one? [Re: ZZman] #4541318
10/12/17 02:54 PM
10/12/17 02:54 PM
Joined: Nov 2008
Posts: 3,277
Oshawa, Ontario Canada
JC1 Offline
JC1  Offline
Joined: Nov 2008
Posts: 3,277
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.


2015 Grand Caravan SXT Plus 5w-20 PPPP/Fram Ultra Filter
1997 Honda Civic CX 5w-30 Shell Conventional/Fram Ultra Filter
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