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#4441778 - 06/26/17 08:55 AM 8K too long OCI ?
marine65 Offline


Registered: 11/27/14
Posts: 451
Loc: Denver
In another thread I posted that I use synthetic oil for 8K miles in my 06 Sentra.
It has a 3 quart capacity.
Someone posted that this is too many miles for only 3 quarts.
I never thought of that.
Opinions?
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2006 Nissan Sentra 192K miles
2010 Hyundai Elantra 84K miles

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#4441789 - 06/26/17 09:15 AM Re: 8K too long OCI ? [Re: marine65]
DeepFriar Offline


Registered: 10/31/13
Posts: 1367
Loc: Georgia
Another tiny sump Sentra here and, personal preference, 8K is about the limit in my mind. Bearing in mind that there is no right answer - too many variables as usual. Stick with syn though with such a small sump.

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#4441792 - 06/26/17 09:17 AM Re: 8K too long OCI ? [Re: marine65]
demarpaint Offline


Registered: 07/03/05
Posts: 29758
Loc: NY
You'll get a lot of opinions, get a UOA and you'll have facts. It could be damaging your engine, or you could be just fine. I often read blanket statements here like a good dino oil can go 5K miles and a good synthetic 10K miles, or something along those lines. I know for a fact that in my case that is not true and have UOA data to back it up. Bottom line get a UOA to be sure.

Opinion: if you sit in traffic and have a 3 qt sump 8K miles is too long.
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#4441804 - 06/26/17 09:38 AM Re: 8K too long OCI ? [Re: marine65]
WillsYoda Offline


Registered: 10/17/15
Posts: 471
Loc: MN
If the miles are Highway, it is ok. If you are in traffic doing short trips, I might go shorter. A UOA will tell you more.

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#4441808 - 06/26/17 09:43 AM Re: 8K too long OCI ? [Re: demarpaint]
bbhero Online   content


Registered: 03/20/15
Posts: 4625
Loc: Virginia
+1 to what demarpaint said.
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Nissan Altima 3.5 Coupe Valvoline Advanced Full Synthetic 5w30 Federated Auto 4612ex
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#4441830 - 06/26/17 10:21 AM Re: 8K too long OCI ? [Re: marine65]
Donald Offline


Registered: 03/21/04
Posts: 20455
Loc: Upstate NY
UOA
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#4441853 - 06/26/17 10:45 AM Re: 8K too long OCI ? [Re: marine65]
Vladiator Offline


Registered: 01/04/16
Posts: 728
Loc: NC
As stated above, and as I mentioned it in another thread, 8k might be pushing it. Think of it this way... If we control one single drop of oil in the sump through it's life cycle - we will see that the drop will pass through the filter and oil passages and all of the engine 1 million times (random number) in a 6 quart 4 cylinder engine. Well in a 4 cylinder engine with a 3 quart sump the same drop will see the engine surfaces twice as much. I believe that at such point the oil additive package could be in a shape that does not provide ultimate protection anymore, and all it will take is a small increase in oil stress (WOT or long idling time, etc) to reach it's limits and cause irreversible damage to the engine. Spun bearing, camshaft/crankshaft surfaces, cylinder walls, etc. I'd rather be safe than sorry.
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Thicker oils give protection for severe operations such as driving in mountains, pulling a boat, dusty conditions, short trips, high rpm, overloading, overheating and overcooling. Thin oils give MPG.

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#4441911 - 06/26/17 11:57 AM Re: 8K too long OCI ? [Re: marine65]
WobblyElvis Online   content


Registered: 09/23/14
Posts: 1345
Loc: Toronto Canada
Opinion: you don't really know without performing an oil analysis.

Experience: I've run conventional oil 8,000 miles of mixed driving and an oil analysis has said it was still good.

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#4441931 - 06/26/17 12:21 PM Re: 8K too long OCI ? [Re: marine65]
SirTanon Online   content


Registered: 06/23/14
Posts: 2157
Loc: Phoenix, Arizona - USA
All good suggestions made so far. With only a 3-quart sump, I'd be nervous about going 8,000 miles unless it was all highway miles.

Having said that, as others have stated, getting a Used Oil Analysis done will definitely help determine if 8k is too much for your oil. If it were me, I'd do a pull @ 6k miles, and see how it is.. and go from there.

I would also like to add that you should also make sure your air filter is in good shape. If it's got a hole, or is not filtering well enough, or is not in there right (and thus letting stuff by), your oil is definitely not going to look good.
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2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 257,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 55,000mi

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#4441970 - 06/26/17 01:29 PM Re: 8K too long OCI ? [Re: marine65]
NStuart Offline


Registered: 12/28/16
Posts: 278
Loc: Sav ga
Even 5000 miles on synthetic in my pickup truck can get a little out of line
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#4441973 - 06/26/17 01:32 PM Re: 8K too long OCI ? [Re: marine65]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
I'm curious to know what peculiarities your engine has.

I've seen Mobil 1 go 30,000 miles in a 5 quart pan Chevy 350.
Of course, that's a low-power-density application (about 1/2hp per cu/in)
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(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4442064 - 06/26/17 03:27 PM Re: 8K too long OCI ? [Re: marine65]
marine65 Offline


Registered: 11/27/14
Posts: 451
Loc: Denver
I've been running 8K or so OCI with full synthetic for the 81K out of 178K miles that I've owned the car.
I never have to add oil.
This next oil change will be the first oil analysis I've done.
My driving is 80 % high way but there is a lot of stop and go during rush hour.
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2006 Nissan Sentra 192K miles
2010 Hyundai Elantra 84K miles

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#4442512 - 06/27/17 06:03 AM Re: 8K too long OCI ? [Re: marine65]
SR5 Offline


Registered: 07/07/15
Posts: 4462
Loc: Down Under
What does the owners manual say ?
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#4443016 - 06/27/17 05:45 PM Re: 8K too long OCI ? [Re: marine65]
BrocLuno Offline


Registered: 09/06/15
Posts: 5514
Loc: Kalifornia Kollective
Does it use a spin-on filter? If so, you might see if you can find a bigger one that will fit and bring up your total sump capacity a bit.

I'd prolly limit it to 6,000 miles for my peace of mind ... smile
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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