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

Registered: 11/27/14
Posts: 379
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.
2006 Nissan Sentra 186K miles
2010 Hyundai Elantra 80K miles

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

Registered: 10/31/13
Posts: 1352
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.

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

Registered: 07/03/05
Posts: 29092
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.
God Bless Our Troops

#4441804 - 06/26/17 09:38 AM Re: 8K too long OCI ? [Re: marine65]
WillsYoda Offline

Registered: 10/17/15
Posts: 467
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.

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

Registered: 03/20/15
Posts: 4173
Loc: Virginia
+1 to what demarpaint said.
Nissan Altima 3.5 Coupe
Federated Auto Full Synthetic 5w30 Hastings LF 240
"Treat your family like your friends and treat your friends like your family."

#4441830 - 06/26/17 10:21 AM Re: 8K too long OCI ? [Re: marine65]
Donald Offline

Registered: 03/21/04
Posts: 20111
Loc: Upstate NY
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)

#4441853 - 06/26/17 10:45 AM Re: 8K too long OCI ? [Re: marine65]
Vladiator Online   content

Registered: 01/04/16
Posts: 695
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.

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

Registered: 09/23/14
Posts: 1227
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.

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

Registered: 06/23/14
Posts: 1878
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.
2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 250,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 50,000mi

#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
Detroit14l 1m75k mi bp schaffer9k 30k oil
96 ram 5.9 gas 80k built tranny 5k m1
85 cj7 4.2 performance build. Schaeffer 9000
08 cbr600rr graffiti. T6

#4441973 - 06/26/17 01:32 PM Re: 8K too long OCI ? [Re: marine65]
Linctex Offline

Registered: 12/31/16
Posts: 5135
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)
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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

Registered: 11/27/14
Posts: 379
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.
2006 Nissan Sentra 186K miles
2010 Hyundai Elantra 80K miles

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

Registered: 07/07/15
Posts: 4174
Loc: Down Under
What does the owners manual say ?
Penrite Vantage 10W40 SN & A3/B4 + Wesfil-Cooper Z154

#4443016 - 06/27/17 05:45 PM Re: 8K too long OCI ? [Re: marine65]
BrocLuno Offline

Registered: 09/06/15
Posts: 5057
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
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.