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Why would a short OCI clean better? #4550060
10/21/17 10:21 AM
10/21/17 10:21 AM
Joined: Feb 2015
Posts: 326
Phoenix, Az
MoreCowbellAz Offline OP
MoreCowbellAz  Offline OP
Joined: Feb 2015
Posts: 326
Phoenix, Az
Folks on here often say in order to clean up an engine they'll run a few short OCI's of like 3k before going to a regular OCI of say 5-7k. My question is if oil is still in good shape at 5-7k (or even at 10k), what benefit are you getting from a super short OCI like 3k? Would it be even better at 1k? If the additives, TBN, TAN, etc are all in the good range at 7k then I would think it's doing the same amount of cleaning at 7k as it would at 3k, 1k, etc. No? I'm wondering if we're just catering to our internal warm fuzzies when we think our oil is cleaning way better at an OCI half of what the oil is good for, or is this actually true?


07 Toyota RAV4 2.4L
07 Toyota Prius Touring
00 Harley Road King Classic
11 Kia Soul 2.0L (mine to maintain)
Re: Why would a short OCI clean better? [Re: MoreCowbellAz] #4550073
10/21/17 10:30 AM
10/21/17 10:30 AM
Joined: Aug 2011
Posts: 9,560
Boston, MA
HerrStig Offline
HerrStig  Offline
Joined: Aug 2011
Posts: 9,560
Boston, MA
Do the "cleaning obsessed" do "body flushes" as well?

Last edited by HerrStig; 10/21/17 10:34 AM.
Re: Why would a short OCI clean better? [Re: MoreCowbellAz] #4550081
10/21/17 10:33 AM
10/21/17 10:33 AM
Joined: Dec 2006
Posts: 18,620
Dallas,Tx USA
aquariuscsm Offline
aquariuscsm  Offline
Joined: Dec 2006
Posts: 18,620
Dallas,Tx USA
I'm guessing the short "cleaning phase" oci's keep the cleansing additives fresh and strong.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 5W20

Re: Why would a short OCI clean better? [Re: MoreCowbellAz] #4550083
10/21/17 10:36 AM
10/21/17 10:36 AM
Joined: Mar 2017
Posts: 568
West Ma.
rollinpete Offline
rollinpete  Offline
Joined: Mar 2017
Posts: 568
West Ma.
I would think if your dealing with a dirty abused engine, the additives wouldn't last as long in a long oci thus the reason for a few short ones...


Pete.
97 Ford Expl.Sport 4.0 ohv 4wd 5spddrive184k miles
Last Change;
Penn. Plat. HM. 5w30
Fram xg8a, Fram CA8141

I like my oil (slippery).

Re: Why would a short OCI clean better? [Re: MoreCowbellAz] #4550085
10/21/17 10:37 AM
10/21/17 10:37 AM
Joined: Feb 2011
Posts: 6,718
Hudson, NH
LeakySeals Offline
LeakySeals  Offline
Joined: Feb 2011
Posts: 6,718
Hudson, NH
I think its more about the oil selection than the time spent in the engine.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Why would a short OCI clean better? [Re: aquariuscsm] #4550090
10/21/17 10:41 AM
10/21/17 10:41 AM
Joined: Oct 2009
Posts: 3,209
Wet side WA
JohnnyJohnson Offline
JohnnyJohnson  Offline
Joined: Oct 2009
Posts: 3,209
Wet side WA
Originally Posted By: aquariuscsm
I'm guessing the short "cleaning phase" oci's keep the cleansing additives fresh and strong.


Yah kind of like washing your clothes with clean water and some fresh detergent!

But then how many loads of laundry could you get out of a washer if you didn't let it go into rinse. The possibilities could be limitless.

Last edited by JohnnyJohnson; 10/21/17 10:43 AM.

2004 Corolla 124705
Out: VML 5w-30 TG4967 OCI 5007 Miles
In: EDGE EP 5W-30 Bosch 3311 122537 7-18-18
2006 Duramax 74277
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 74705 4-22-18
Re: Why would a short OCI clean better? [Re: JohnnyJohnson] #4550097
10/21/17 10:45 AM
10/21/17 10:45 AM
Joined: Dec 2006
Posts: 18,620
Dallas,Tx USA
aquariuscsm Offline
aquariuscsm  Offline
Joined: Dec 2006
Posts: 18,620
Dallas,Tx USA
Originally Posted By: JohnnyJohnson
Yah kind of like washing your clothes with clean water and some fresh detergent!


Yep,just like that. Like it you have a filthy rag,and you wash it once until the water gets dirty,then make more fresh water/detergent and wash the rag again. Rinse,repeat until it's clean.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 5W20

Re: Why would a short OCI clean better? [Re: aquariuscsm] #4550098
10/21/17 10:46 AM
10/21/17 10:46 AM
Joined: Feb 2011
Posts: 6,718
Hudson, NH
LeakySeals Offline
LeakySeals  Offline
Joined: Feb 2011
Posts: 6,718
Hudson, NH
Originally Posted By: aquariuscsm
Originally Posted By: JohnnyJohnson
Yah kind of like washing your clothes with clean water and some fresh detergent!


Yep,just like that. Like it you have a filthy rag,and you wash it once until the water gets dirty,then make more fresh water/detergent and wash the rag again. Rinse,repeat until it's clean.

Good point, the rinse phase is just as important as the detergent/cleaning phase.


06 Escalade 6.0L LQ9 AWD 165k M1 5w30
03 Maxima 3.5L POS 152k ST HM 10w30
Re: Why would a short OCI clean better? [Re: MoreCowbellAz] #4550190
10/21/17 01:12 PM
10/21/17 01:12 PM
Joined: Sep 2015
Posts: 3,861
Connecticut
69GTX Offline
69GTX  Offline
Joined: Sep 2015
Posts: 3,861
Connecticut
A lot of that old sludge/dirt left behind in the past starts becoming suspended into the newer oil. The sooner it's carried away (by a shorter OCI) the better.


----------------

2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs
Re: Why would a short OCI clean better? [Re: rollinpete] #4550214
10/21/17 01:40 PM
10/21/17 01:40 PM
Joined: Oct 2005
Posts: 7,094
Colorado
Kuato Offline
Kuato  Offline
Joined: Oct 2005
Posts: 7,094
Colorado
Originally Posted By: rollinpete
I would think if your dealing with a dirty abused engine, the additives wouldn't last as long in a long oci thus the reason for a few short ones...


This. A shorter interval is just making sure the additives aren't used up before the next change.

I also like the dirty rag analysis thumbsup


Thick vs Thin test: 15k / 43k miles complete
Re: Why would a short OCI clean better? [Re: MoreCowbellAz] #4550216
10/21/17 01:41 PM
10/21/17 01:41 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
3000 is not a short OCI---1700 is.

If the engine is dirty and the oil is cleaning good, then the oil will get dark fast.

When the oil gets saturated with dirt and turns dark, change it out and run another short OCI.

Re: Why would a short OCI clean better? [Re: Merkava_4] #4550333
10/21/17 05:02 PM
10/21/17 05:02 PM
Joined: Jun 2010
Posts: 591
Florida
Dumc87 Offline
Dumc87  Offline
Joined: Jun 2010
Posts: 591
Florida
Originally Posted By: Merkava_4
3000 is not a short OCI---1700 is.

If the engine is dirty and the oil is cleaning good, then the oil will get dark fast.

When the oil gets saturated with dirt and turns dark, change it out and run another short OCI.


I'm doing this now with my G20, as I recently replaced the engine with a good used one. Engine was very clean, but I am running "short" OCI of 4K with PP 0w40. It is just now starting to darken at 3K miles, so I'd say this oil could go 6-7K, but I'd rather make use of some of the QSUD I invested in laugh


'90 Z32 - PP HM 10w30
'98 ZJ - PYB HM 10w40
'02 G20 - QS UD 5w30
'09 Matrix - QS UD 0w20
Re: Why would a short OCI clean better? [Re: MoreCowbellAz] #4550396
10/21/17 06:30 PM
10/21/17 06:30 PM
Joined: Jun 2011
Posts: 1,755
Crawfordville FL
SilverFusion2010 Offline
SilverFusion2010  Offline
Joined: Jun 2011
Posts: 1,755
Crawfordville FL
I agree. If the oil turns black in 500-1000 miles in a GAS engine, it's most likely cleaning up sludge and should be changed frequently until the time it takes for the oil to darken extends out to 2-3k. I've got 1k on this oci of M1 AFE 0w-20 and when I checked the dipstick this morning the oil had darkened just slightly. Enough to make the dipstick easier to read.


2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30

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