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#4450103 - 07/05/17 07:14 AM Thinking Too Much, Endless Possibilities
Red91 Offline


Registered: 12/09/13
Posts: 2124
Loc: Alabama, United States
Basic theory: 20K OCI on a 1992 Buick Roadmaster wagon with a TBI 5.7 V8
Oil: SJ Kendall GT-1 30wt
Variables: unpredictable driving conditions, ranging from long trips to 5 minute sprints with engine on/off/on scenarios
How?: 1 solid 10K run with a filter change and top off at 10K, 1 solid 5K run with filter change and top off at 15K, another 5K run with complete oil and filter change at 20K
Why?: In theory, presuming a full quart for top off at the filter changes, the fresh 30wt oil should be sufficient to refresh the additive package and TBN, without sacrificing the tribofilm antiwear layers already in place with the used oil

Thoughts?
_________________________
'89 Chevy 1500
Napa 20/50
'15 Chevy Cruze
AcDelco syn dexos 5/30

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#4450117 - 07/05/17 07:34 AM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
supton Offline


Registered: 11/09/08
Posts: 11909
Loc: NH
What is the gain? Less oil used, less waste; or just because you can?

SJ oil?

If it was me, I'd just change it. IIRC this engine was one of those that did well on 3k OCI & dino, racking up miles and miles. Heavy car, low output engine, unknown usage. Lots of gas through the engine. Might not be "severe" but if it was me I'd err towards lower changes.
_________________________
2011 Toyota Camry, base, 2.5L/6MT, 160k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 143k, ours
1999 Toyota Camry LE, 2.2L/4AT, 181k, his

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#4450130 - 07/05/17 07:59 AM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
Bottom_Feeder Offline


Registered: 12/07/08
Posts: 3004
Loc: Occupied Virginia
You're replenishing some of the add pack but you're not removing the contaminants.

You're under the car getting dirty anyway. Why not just change the oil?

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#4450142 - 07/05/17 08:11 AM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
mightymousetech Offline


Registered: 04/03/17
Posts: 1443
Loc: Ontario, Canada
Would be a lot simpler to just change the oil every 10k instead of changing the filter every 5k. I change my filter every second oil change, a dirty filter works better than a new filter.
_________________________
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Acura Tech
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#4450166 - 07/05/17 08:32 AM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
Cujet Offline


Registered: 02/15/03
Posts: 7139
Loc: Jupiter, Florida
Unless you are using a micronic filter, and some form of contaminate reduction, that's not a recipe for maximum engine life. Microparticulates do cause wear, and pushrod engines do produce plenty of particulates.

I'd suggest a standard oil change interval, using a quality oil.

In fact, GM warranty repaired plenty of timing and balancer chains due to extended OCI's. The culprit: particulates and viscosity loss.
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#4450167 - 07/05/17 08:33 AM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
Red91 Offline


Registered: 12/09/13
Posts: 2124
Loc: Alabama, United States
I'm not changing the filter every 5K. The first run is 10K, then a 5K. Yes, to conserve resources. Ideally this would allow the oil to only be changed every 2 years, or 18,000 to 20,000 miles.
_________________________
'89 Chevy 1500
Napa 20/50
'15 Chevy Cruze
AcDelco syn dexos 5/30

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#4450229 - 07/05/17 09:45 AM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
TexasVaquero Offline


Registered: 05/31/17
Posts: 127
Loc: South Texas Rancho
Sounds like a recipe for sludge in spite of having some new oil in there. As posted earlier, you wouldn't be getting rid of all the dirt.


Edited by TexasVaquero (07/05/17 09:45 AM)
_________________________
2014 NISSAN VERSA 5spd M/T- M1 EP 5w30 and M1 EP Filter. 5k OCI.
2011 CHEVY IMPALA 3.5ltrs - M1 HM 5w30 and M1 EP Filter. 3k OCI.

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#4450261 - 07/05/17 10:15 AM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
Linctex Online   content


Registered: 12/31/16
Posts: 6146
Loc: Waco, TX
I'd run the cheapest oil & filter available and do 10K on each/both.

From my observations on here and personally, I see no need to do anything exotic. My 5.0 (302) has 284,000 miles on it, my 454 has 271,000 - your ol' 350 should do it easily, too.
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4450273 - 07/05/17 10:25 AM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
1JZ_E46 Offline


Registered: 04/04/16
Posts: 1218
Loc: Oregon
I'll never understand the fascination with extending drain intervals to ridiculous levels like this. Expect the oil to be the consistency of gear oil by the end of your test.
_________________________
2007 BMW X5 4.8i, 105K: Castrol EDGE 0W-40, Mann
2012 Mini Cooper, 45K: Castrol EDGE 0W-30, Mann

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#4450281 - 07/05/17 10:31 AM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
demarpaint Offline


Registered: 07/03/05
Posts: 29734
Loc: NY
Originally Posted By: Red91
Basic theory: 20K OCI on a 1992 Buick Roadmaster wagon with a TBI 5.7 V8
Oil: SJ Kendall GT-1 30wt
Variables: unpredictable driving conditions, ranging from long trips to 5 minute sprints with engine on/off/on scenarios
How?: 1 solid 10K run with a filter change and top off at 10K, 1 solid 5K run with filter change and top off at 15K, another 5K run with complete oil and filter change at 20K
Why?: In theory, presuming a full quart for top off at the filter changes, the fresh 30wt oil should be sufficient to refresh the additive package and TBN, without sacrificing the tribofilm antiwear layers already in place with the used oil

Thoughts?


I guess at the end of the life cycle of a beater which will ultimately end up in the junkyard, why not? If you plan on keeping the car I wouldn't do it. If you plan on selling it don't reveal your oil change regime. Most car buffs will avoid vehicles which have ultra long OCI's, premium extended drain boutique oil or not.
_________________________
God Bless Our Troops


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#4450282 - 07/05/17 10:31 AM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
E150GT Offline


Registered: 03/11/12
Posts: 1088
Loc: San Antonio, TX
Perhaps put a bypass filter system on it.
_________________________
1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 250k 5w30
2016 Mazda6 Touring 6MT - 56k 10w30

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#4450302 - 07/05/17 10:50 AM Re: Thinking Too Much, Endless Possibilities [Re: Linctex]
Red91 Offline


Registered: 12/09/13
Posts: 2124
Loc: Alabama, United States
I already have cheap oil and filters.....
_________________________
'89 Chevy 1500
Napa 20/50
'15 Chevy Cruze
AcDelco syn dexos 5/30

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#4450324 - 07/05/17 11:19 AM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
WishIhadatruck Offline


Registered: 05/09/06
Posts: 1397
Loc: Grand Rapids, MI
I have a '96 version of your car, with an updated motor design. Not long after purchasing mine in 2006, I did a number of UOA and none of the oils I tried were happy past 5k miles. Start with a UOA at 5k miles (don't change the oil until after the results come back if you want) and go from there. I realize what you're trying to accomplish, but there is no way to know if this is an acceptable condition unless you monitor the oil somehow.
_________________________
1996 Buick Roadmaster Wagon
2014 Cruze Eco Manual
2003 2500 Suburban, 8.1L

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#4450398 - 07/05/17 12:35 PM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
Cujet Offline


Registered: 02/15/03
Posts: 7139
Loc: Jupiter, Florida
Originally Posted By: Red91
I'm not changing the filter every 5K. The first run is 10K, then a 5K. Yes, to conserve resources. Ideally this would allow the oil to only be changed every 2 years, or 18,000 to 20,000 miles.


That's fine. It's not necessary. Nor will I make the absurd claim that you will experience engine failure. What you are proposing is a perfect plan for a vehicle you don't care about and don't plan on keeping all that long. Filter changes are seldom required. Oil changes are far more important.

However, as professionals know (such as myself) , via objective data, proper regular maintenance is required for maximum lifespan. My old Ford truck, very healthy at 355,000 miles is a good example of why regular service can save you time, money and hassle.

In a past life, I worked for Mobil oil and was involved in some oil and grease testing. Also worked for Mercury Marine testing oils in race engines. I now work in the high end world of G650 business jets.

The good news is that over 20,000 miles, of zero oil changes, you will have saved yourself about $25 per year.


Edited by Cujet (07/05/17 12:39 PM)
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#4450403 - 07/05/17 12:41 PM Re: Thinking Too Much, Endless Possibilities [Re: Red91]
Cujet Offline


Registered: 02/15/03
Posts: 7139
Loc: Jupiter, Florida
As mentioned above, the oil change is more important than the filter change. In fact, with healthy engines, filter changes are rarely necessary.
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