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#4550060 - 10/21/17 10:21 AM Why would a short OCI clean better?
MoreCowbellAz Offline


Registered: 02/05/15
Posts: 322
Loc: 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?
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07 Toyota RAV4 2.4L
07 Toyota Prius Touring
00 Harley Road King Classic
11 Kia Soul 2.0L (mine to maintain)

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#4550073 - 10/21/17 10:30 AM Re: Why would a short OCI clean better? [Re: MoreCowbellAz]
HerrStig Offline


Registered: 08/24/11
Posts: 9560
Loc: Boston, MA
Do the "cleaning obsessed" do "body flushes" as well?


Edited by HerrStig (10/21/17 10:34 AM)

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#4550081 - 10/21/17 10:33 AM Re: Why would a short OCI clean better? [Re: MoreCowbellAz]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18142
Loc: 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
Pennzoil Platinum 0W20



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#4550083 - 10/21/17 10:36 AM Re: Why would a short OCI clean better? [Re: MoreCowbellAz]
rollinpete Online   content


Registered: 03/20/17
Posts: 440
Loc: 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 5spddrive183k miles
Last Change;
Penn. Plat. HM 5w30
Fram xg8a, Fram CA8141

Change your oil, Happy engine, Happy owner.

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#4550085 - 10/21/17 10:37 AM Re: Why would a short OCI clean better? [Re: MoreCowbellAz]
LeakySeals Offline


Registered: 02/18/11
Posts: 6561
Loc: Hudson, NH
I think its more about the oil selection than the time spent in the engine.
_________________________
06 Escalade 6.0L AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 149k ST HM 10w30

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#4550090 - 10/21/17 10:41 AM Re: Why would a short OCI clean better? [Re: aquariuscsm]
JohnnyJohnson Online   content


Registered: 10/22/09
Posts: 2730
Loc: 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.


Edited by JohnnyJohnson (10/21/17 10:43 AM)
_________________________
2004 Toyota Corolla 121478
Out: QSUD 5W-30 Purolator One 5030
In: Valvoline ML 5w-30 TG4967 117530 2-8-18
2006 Duramax 74016
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73752 4-22-18

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#4550097 - 10/21/17 10:45 AM Re: Why would a short OCI clean better? [Re: JohnnyJohnson]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18142
Loc: 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
Pennzoil Platinum 0W20



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#4550098 - 10/21/17 10:46 AM Re: Why would a short OCI clean better? [Re: aquariuscsm]
LeakySeals Offline


Registered: 02/18/11
Posts: 6561
Loc: 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 AWD 160k. M1 5w30 Fram TG
03 Maxima 3.5L 149k ST HM 10w30

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#4550190 - 10/21/17 01:12 PM Re: Why would a short OCI clean better? [Re: MoreCowbellAz]
69GTX Offline


Registered: 09/23/15
Posts: 3815
Loc: 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.
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----------------

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

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#4550214 - 10/21/17 01:40 PM Re: Why would a short OCI clean better? [Re: rollinpete]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: 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

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#4550216 - 10/21/17 01:41 PM Re: Why would a short OCI clean better? [Re: MoreCowbellAz]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: 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.

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#4550333 - 10/21/17 05:02 PM Re: Why would a short OCI clean better? [Re: Merkava_4]
Dumc87 Offline


Registered: 06/05/10
Posts: 591
Loc: 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
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'90 Z32 - PP HM 10w30
'98 ZJ - PYB HM 10w40
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'09 Matrix - QS UD 0w20

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#4550396 - 10/21/17 06:30 PM Re: Why would a short OCI clean better? [Re: MoreCowbellAz]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1651
Loc: 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.
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2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30

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