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Engine Flush Question #4685313
03/05/18 03:33 PM
03/05/18 03:33 PM
Joined: Sep 2010
Posts: 131
Wauconda, Illinois
HiccaBurp Offline OP
HiccaBurp  Offline OP
Joined: Sep 2010
Posts: 131
Wauconda, Illinois
My 2007 Prius has 215,000 miles. I was going to use Liqui Moly Engine Flush.
1. I was going to drain and fill with fresh oil, do the Flush, do a fresh filter and oil change
2. I'm running T6 5w40 due to oil consumption with 5w30
3. For the Flush fill and drain, should I use the 5w40? Or a lighter weight oil? Which one would help clean better?



08 Toyota Sequoia 5.7 Lim | 106k | Dino | 6k OCI
07 Toyota Prius Touring Pkg 3 | 65k | M1 5w-30 | 15k OCI
03 Chevy Express EXT 3500 | M1 5w-30 | 5k OCI
Re: Engine Flush Question [Re: HiccaBurp] #4685322
03/05/18 03:38 PM
03/05/18 03:38 PM
Joined: Jan 2009
Posts: 13,972
Illinois
tig1 Offline
tig1  Offline
Joined: Jan 2009
Posts: 13,972
Illinois
Is your engine full of sludge?


2007 Ford Fusion 235,000 miles
M1 0-20 EP
2017 Ford Fusion 60K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and Valvoline LV
M1 10-30 in all OPE
MC filters

Re: Engine Flush Question [Re: HiccaBurp] #4685342
03/05/18 03:53 PM
03/05/18 03:53 PM
Joined: Jun 2014
Posts: 2,730
Phoenix, Arizona - USA
SirTanon Offline
SirTanon  Offline
Joined: Jun 2014
Posts: 2,730
Phoenix, Arizona - USA
The first thought that comes to mind is: Have you verified that the engine in that vehicle is in need of a flush, or are you just doing this as a "preventive measures" sort of thing?

T6 is a pretty darn good oil when it comes to cleaning things up, so I have to wonder if a flush is really even necessary.


2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 266,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 60,000mi
Re: Engine Flush Question [Re: SirTanon] #4685353
03/05/18 04:10 PM
03/05/18 04:10 PM
Joined: Sep 2010
Posts: 131
Wauconda, Illinois
HiccaBurp Offline OP
HiccaBurp  Offline OP
Joined: Sep 2010
Posts: 131
Wauconda, Illinois
Originally Posted By: SirTanon
The first thought that comes to mind is: Have you verified that the engine in that vehicle is in need of a flush, or are you just doing this as a "preventive measures" sort of thing?

T6 is a pretty darn good oil when it comes to cleaning things up, so I have to wonder if a flush is really even necessary.


More of a "preventative maintenance" step. I had some long OCI in the past. Read some users on the Prius Chat Forums did the flush with good results. Supposedly there are a couple of oil channels that get clocked up over time. I've had her since new.. i don't mind paying a few dollars for a TLC.

The current fill is only my 2nd fill with T6. Engine seems smoother and no detonation at load. I was using mostly M1 5w30 it's whole life. After 150k, it started consuming oil to the point of almost 2 quarts at 5k OCI. With the 0w40 T6.. i can go the whole OCI without adding oil smile

The oil consumption is an issue with these engines. Some have had success with removing the spark plugs and soaking the cylinders with Sea Foam or similar. Guess the rings get stuck in one position and freeing them helps tremendously


08 Toyota Sequoia 5.7 Lim | 106k | Dino | 6k OCI
07 Toyota Prius Touring Pkg 3 | 65k | M1 5w-30 | 15k OCI
03 Chevy Express EXT 3500 | M1 5w-30 | 5k OCI
Re: Engine Flush Question [Re: HiccaBurp] #4685354
03/05/18 04:10 PM
03/05/18 04:10 PM
Joined: Feb 2018
Posts: 207
California
Bullwinkle007 Offline
Bullwinkle007  Offline
Joined: Feb 2018
Posts: 207
California
If you use lighter oil, you will consume more oil, you can continue what you are using or use Castrol euro 0/40. That is good with good mfg specs. I wouldn't do a flush if you have changed your oil on a regular basis

Re: Engine Flush Question [Re: SirTanon] #4685355
03/05/18 04:11 PM
03/05/18 04:11 PM
Joined: Feb 2014
Posts: 1,786
Texas
Dallas69 Offline
Dallas69  Offline
Joined: Feb 2014
Posts: 1,786
Texas
Never use a flush unless you are sure your engine needs it.This should not be done just because. If you change your oil on schedule then your engine is clean enough.
You can cause more issues.


2009 Galant-ultra oil and filter
1987 Ford F-150 302
Smittys 5-30
Motorcraft filter
Re: Engine Flush Question [Re: Dallas69] #4685370
03/05/18 04:30 PM
03/05/18 04:30 PM
Joined: Jun 2009
Posts: 1,824
Wisconsin
wallyuwl Offline
wallyuwl  Offline
Joined: Jun 2009
Posts: 1,824
Wisconsin
Originally Posted By: Dallas69
Never use a flush unless you are sure your engine needs it.This should not be done just because. If you change your oil on schedule then your engine is clean enough.
You can cause more issues.


Agreed. But you may want to do the Seafoam soak you mentioned.

Re: Engine Flush Question [Re: Bullwinkle007] #4685381
03/05/18 04:39 PM
03/05/18 04:39 PM
Joined: Sep 2010
Posts: 131
Wauconda, Illinois
HiccaBurp Offline OP
HiccaBurp  Offline OP
Joined: Sep 2010
Posts: 131
Wauconda, Illinois
Originally Posted By: Bullwinkle007
If you use lighter oil, you will consume more oil, you can continue what you are using or use Castrol euro 0/40. That is good with good mfg specs. I wouldn't do a flush if you have changed your oil on a regular basis


I have no intentions of using anything other than 0w40. Actually, I have Castrol Euro 0w40 waiting in the garage for the next OCI. I used that in my german cars and it worked great!!!

My question about the lighter weight oil was for the 10-15 min while doing the flush only. But, reading these comments, i'm not sure I should do an engine flush??


08 Toyota Sequoia 5.7 Lim | 106k | Dino | 6k OCI
07 Toyota Prius Touring Pkg 3 | 65k | M1 5w-30 | 15k OCI
03 Chevy Express EXT 3500 | M1 5w-30 | 5k OCI
Re: Engine Flush Question [Re: Dallas69] #4685382
03/05/18 04:39 PM
03/05/18 04:39 PM
Joined: Sep 2010
Posts: 131
Wauconda, Illinois
HiccaBurp Offline OP
HiccaBurp  Offline OP
Joined: Sep 2010
Posts: 131
Wauconda, Illinois
Originally Posted By: Dallas69
Never use a flush unless you are sure your engine needs it.This should not be done just because. If you change your oil on schedule then your engine is clean enough.
You can cause more issues.


How do you know if "you need it"?? I'm going off of reading some favorable posts on the Prius Chat Forums.

I did 15k OCI back in the day.. once it started consuming oil, I switched to 5k. There was one OCI that went over 20k frown I did a UOA and there was still some life in the oil..

Last edited by HiccaBurp; 03/05/18 04:41 PM.

08 Toyota Sequoia 5.7 Lim | 106k | Dino | 6k OCI
07 Toyota Prius Touring Pkg 3 | 65k | M1 5w-30 | 15k OCI
03 Chevy Express EXT 3500 | M1 5w-30 | 5k OCI
Re: Engine Flush Question [Re: HiccaBurp] #4685388
03/05/18 04:49 PM
03/05/18 04:49 PM
Joined: Dec 2006
Posts: 974
midwest
JamesBond Offline
JamesBond  Offline
Joined: Dec 2006
Posts: 974
midwest
If the inside of your engine has enough deposits that you need to do an engine flush, you should also plan on pulling the oil pan and cleaning the oil pickup screen afterward. If you're not prepared to do this I would l probably skip the engine flush.

Re: Engine Flush Question [Re: HiccaBurp] #4685398
03/05/18 04:59 PM
03/05/18 04:59 PM
Joined: Jan 2015
Posts: 98
Charles City, Iowa
rideahorse Offline
rideahorse  Offline
Joined: Jan 2015
Posts: 98
Charles City, Iowa
Some day the thin syn oil guys will learn why you don't do extended oil drains.

Re: Engine Flush Question [Re: JamesBond] #4685400
03/05/18 05:02 PM
03/05/18 05:02 PM
Joined: Sep 2010
Posts: 131
Wauconda, Illinois
HiccaBurp Offline OP
HiccaBurp  Offline OP
Joined: Sep 2010
Posts: 131
Wauconda, Illinois
Originally Posted By: JamesBond
If the inside of your engine has enough deposits that you need to do an engine flush, you should also plan on pulling the oil pan and cleaning the oil pickup screen afterward. If you're not prepared to do this I would l probably skip the engine flush.


Very true! Just might skip the engine flush and continue using quality oil 👍


08 Toyota Sequoia 5.7 Lim | 106k | Dino | 6k OCI
07 Toyota Prius Touring Pkg 3 | 65k | M1 5w-30 | 15k OCI
03 Chevy Express EXT 3500 | M1 5w-30 | 5k OCI
Re: Engine Flush Question [Re: HiccaBurp] #4685403
03/05/18 05:06 PM
03/05/18 05:06 PM
Joined: Feb 2018
Posts: 509
Chester County/Pa.
BAJA_05 Offline
BAJA_05  Offline
Joined: Feb 2018
Posts: 509
Chester County/Pa.
I used that same product in my old 1990 Toyota Camry 2.0L acouple years ago. That and paired with Mobil One HM 10W40 cut consumption down drastically. Before the engine flush, I was using 10W30 and going through a quart every 1500 miles. LM makes good/reputable products.

Dale


2017 VW Jetta SE TSI 1.4L Turbo (hers)
M1 Euro 0W40 & FU (19K)
2008 Acura TL 3.2L PPPP 0W20 & FU (108K)
2005 Subaru Baja AWD 2.5L N/A 5spd.
QSHM 5W30 & FU (96K)
2000 Ram 4X4 5.9L (93K) PYB 10W30 & FU
Re: Engine Flush Question [Re: HiccaBurp] #4685407
03/05/18 05:08 PM
03/05/18 05:08 PM
Joined: Aug 2017
Posts: 558
Nebraska
BJD78 Offline
BJD78  Offline
Joined: Aug 2017
Posts: 558
Nebraska
The risk is likely not worth it. I have seen more than a few vehicles that dumped in engine flush chemicals and the flush ends up doing more harm than good and they end up replacing main seals and other oil gaskets and clogging up the oil pickup and and they end up with a ride on a wrecker. Not worth the risk IMO. Do a couple of short 2 to 3 K OCI's with the OM recommended weight of oil and change filter each time and that will clean it up without being overly aggressive.


2010 Forester:122K
2009 Sonata :189K
2010 Tucson:55K

OCI 5K using the cheapest dino oil I can buy,usually NAPA or TSC Travelers oil.
Re: Engine Flush Question [Re: HiccaBurp] #4685409
03/05/18 05:11 PM
03/05/18 05:11 PM
Joined: Jul 2017
Posts: 542
Texas (south)
FermeLaPorte Offline
FermeLaPorte  Offline
Joined: Jul 2017
Posts: 542
Texas (south)
What you need to do is use a superior American high mileage oil like Mobil or Valvoline, or even Supertec and not those european products.


Always Mobil 1
2014 1.6L Nissan Versa Sedan, 5 spd, 5k OCI.
2011 3.5L Chevrolet Impala, Automatic, 5k OCI.
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