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#4685313 - 03/05/18 03:33 PM Engine Flush Question
HiccaBurp Offline


Registered: 09/02/10
Posts: 131
Loc: 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

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#4685322 - 03/05/18 03:38 PM Re: Engine Flush Question [Re: HiccaBurp]
tig1 Offline


Registered: 01/03/09
Posts: 13655
Loc: Illinois
Is your engine full of sludge?
_________________________
2007 Ford Fusion 227,000 miles
M1 0-20 EP
2017 Ford Fusion 49K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters


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#4685342 - 03/05/18 03:53 PM Re: Engine Flush Question [Re: HiccaBurp]
SirTanon Offline


Registered: 06/23/14
Posts: 2137
Loc: 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 - 256,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 54,500mi

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#4685353 - 03/05/18 04:10 PM Re: Engine Flush Question [Re: SirTanon]
HiccaBurp Offline


Registered: 09/02/10
Posts: 131
Loc: 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

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#4685354 - 03/05/18 04:10 PM Re: Engine Flush Question [Re: HiccaBurp]
Bullwinkle007 Offline


Registered: 02/12/18
Posts: 138
Loc: 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

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#4685355 - 03/05/18 04:11 PM Re: Engine Flush Question [Re: SirTanon]
Dallas69 Offline


Registered: 02/11/14
Posts: 1660
Loc: 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
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#4685370 - 03/05/18 04:30 PM Re: Engine Flush Question [Re: Dallas69]
wallyuwl Offline


Registered: 06/02/09
Posts: 1776
Loc: 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.

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#4685381 - 03/05/18 04:39 PM Re: Engine Flush Question [Re: Bullwinkle007]
HiccaBurp Offline


Registered: 09/02/10
Posts: 131
Loc: 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

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#4685382 - 03/05/18 04:39 PM Re: Engine Flush Question [Re: Dallas69]
HiccaBurp Offline


Registered: 09/02/10
Posts: 131
Loc: 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..


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

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#4685388 - 03/05/18 04:49 PM Re: Engine Flush Question [Re: HiccaBurp]
JamesBond Offline


Registered: 12/13/06
Posts: 843
Loc: 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.

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#4685398 - 03/05/18 04:59 PM Re: Engine Flush Question [Re: HiccaBurp]
rideahorse Offline


Registered: 01/01/15
Posts: 91
Loc: Charles City, Iowa
Some day the thin syn oil guys will learn why you don't do extended oil drains.

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#4685400 - 03/05/18 05:02 PM Re: Engine Flush Question [Re: JamesBond]
HiccaBurp Offline


Registered: 09/02/10
Posts: 131
Loc: 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

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#4685403 - 03/05/18 05:06 PM Re: Engine Flush Question [Re: HiccaBurp]
BAJA_05 Offline


Registered: 02/04/18
Posts: 336
Loc: Berks 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
PP Euro 0W40 & FU
2008 Acura TL 3.2L QSHM 5W20 & FU
2005 Subaru Baja AWD 2.5L N/A 5spd.
Rotella T6 5W30 & ST

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#4685407 - 03/05/18 05:08 PM Re: Engine Flush Question [Re: HiccaBurp]
BJD78 Offline


Registered: 08/05/17
Posts: 493
Loc: 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.

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#4685409 - 03/05/18 05:11 PM Re: Engine Flush Question [Re: HiccaBurp]
FermeLaPorte Offline


Registered: 07/25/17
Posts: 466
Loc: 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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