Recent Topics
white lithium grease for gearboxes?
by motor_oil_madman
10/17/17 10:20 PM
Synthetic Comparison - Castrol and Valvoline win
by FlyPenFly
10/17/17 10:20 PM
adjustable grease coupler?
by motor_oil_madman
10/17/17 10:18 PM
Mouseblocker Pro for mice in cars
by Donald
10/17/17 10:04 PM
winter is coming. f150
by hyperscion
10/17/17 08:17 PM
Mobil Super 5000 vs Chevron Supreme
by Merkava_4
10/17/17 07:30 PM
Frankenblend ideas
by car51
10/17/17 07:27 PM
Who produces diesel?
by whizbyu
10/17/17 07:27 PM
Windows 10 Fall Creators Update Out!
by Kibitoshin
10/17/17 07:07 PM
Is oil really THAT important?
by camrydriver111
10/17/17 07:02 PM
Warren Distributing
by WyrTwister
10/17/17 06:34 PM
Internet Cache is Ridiculous
by StevieC
10/17/17 05:47 PM
BG44K better than Seafoam / MMO?
by StevieC
10/17/17 04:56 PM
Holding Rubber Door Molding in Place?
by Gebo
10/17/17 04:50 PM
Valvoline VR1 with Catalytic Converters
by Lowrider
10/17/17 04:43 PM
VOA- Quaker State Ultimate Durability 5W-30 D1Gen2
by JustN89
10/17/17 04:23 PM
2016 Traverse M1 0W40 5k miles
by chevman4life
10/17/17 03:11 PM
Road construction - how long does it go on?
by grampi
10/17/17 02:10 PM
FL400S Split
by JiL
10/17/17 01:28 PM
PNZL GLD 5w30 TDS: pre and post Dexos1Gen2
by wemay
10/17/17 12:53 PM
Newest Members
thebisch, jrobert890, xkunalx, Terry270, bigpappa
63145 Registered Users
Who's Online
32 registered (boom10ful, cb_13, Boczech, bdcardinal, bbhero, 1 invisible), 1186 Guests and 12 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
63145 Members
66 Forums
272407 Topics
4521850 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#1253071 - 10/08/08 04:31 PM Does oil degrade with time?
pioneer Offline


Registered: 10/02/08
Posts: 9
Loc: Kansas
This may be a dumb question, but one that I have never really thought about and I'm sure someone can explain to me. Why are OCIs based on time as well as miles. Does the oil degrade while sitting in the engine unused over time?
_________________________
97 F350 7.3
99 F450 7.3
03 & 05 F350 6.0
05 Excursion V10

Top
#1253078 - 10/08/08 04:38 PM Re: Does oil degrade with time? [Re: pioneer]
crw Offline


Registered: 05/31/05
Posts: 1713
Loc: Pocatello, ID
I don't think the oil itself necessarily degrades with time. Time, after all, is what you need to make it. But apparently acids build up over time inside an engine. This is what I've been told as the time factor... but it seems that some simple additives could take care of that.

I think the 3 month recommendation is dated.
_________________________
2005 Nissan Maxima, 6-speed manual; many others...

Top
#1253099 - 10/08/08 05:29 PM Re: Does oil degrade with time? [Re: crw]
pioneer Offline


Registered: 10/02/08
Posts: 9
Loc: Kansas
I have always wondered if the 3 month recommendation was clever marketing years ago that has turned into "fact".
_________________________
97 F350 7.3
99 F450 7.3
03 & 05 F350 6.0
05 Excursion V10

Top
#1253139 - 10/08/08 06:21 PM Re: Does oil degrade with time? [Re: pioneer]
TallPaul Offline


Registered: 10/22/03
Posts: 13124
Loc: By Detroit
I don't worry, but then my stash is in the cellar where it neither gets extreme cold or extreme heat. Shake it good before pouring in engine just in case some additive settled out over the years. I have stash that is 4 years old and before I use it all, some will prob be pushing 10 years. I don't worry about it. I have had oil co reps, like Valvoine, tell me that the shelf life is indefinite.
_________________________
The masses, thirsting for convenience, unwittingly dig the grave of the automobile as we knew it. The industry already has one foot in that grave.

Top
#1253143 - 10/08/08 06:24 PM Re: Does oil degrade with time? [Re: TallPaul]
Bryanccfshr Offline


Registered: 10/09/04
Posts: 5506
Loc: Durango, Co
Once ran in the engine the oil has to deal with contamination, combustion byproducts and moisture. All of these deplete the additives in the oil over timed.

In storage oil should be good for 5 or so years depending on storage temperatures and the types of additives used. The oil itself never goes bad and can be recycled and reused indefinitely following proper purification process such as hydroprocessing.


In the engine the oil doesn't "go bad" It becomes contaminated and the additives that fight contamination and acid build up and act as antiwear and friction modifiers wear out causing the oil to be less effective as a lubricant and corrosion inhibitor.


Edited by Bryanccfshr (10/08/08 06:27 PM)
_________________________
Integrity is what we do when no one's looking.

2010 FJ Cruiser
Mobil 1 0w20 10k mile or 1 year WECF OCI's
2012 BMW F30 with the new N20
Tbd

Top
#1253152 - 10/08/08 06:35 PM Re: Does oil degrade with time? [Re: Bryanccfshr]
TallPaul Offline


Registered: 10/22/03
Posts: 13124
Loc: By Detroit
Oh yeah, should have read the question. In the engine I have run oil for 1 year with no aparent problems. Only not if it's a short trip vehicle a mile here 3 miles there.
_________________________
The masses, thirsting for convenience, unwittingly dig the grave of the automobile as we knew it. The industry already has one foot in that grave.

Top
#1253173 - 10/08/08 07:02 PM Re: Does oil degrade with time? [Re: TallPaul]
greenaccord02 Offline


Registered: 04/22/07
Posts: 5215
Loc: Houston, Tx, USA
The hardware store across the street is selling Valvoline 10W-40 Conventional Turbo-Approved in a white bottle. The promo contest printed on the bottle is to win a racecar... All entries must be received by Dec. 31 1997.

I bought 2 bottles and ran them in the generator... they did well enough.
_________________________
  1. '95 Dakota 3.9L - M1 0W-40 - MC FL1A
  2. '97 Accord F22-B1 - M1 5W-30 - Bosch 3312
  3. '99 Camry 1MZ-FE - PP 5W-30 - M1-209

Top
#1253219 - 10/08/08 07:51 PM Re: Does oil degrade with time? [Re: greenaccord02]
azsynthetic Offline


Registered: 06/01/07
Posts: 1237
Loc: Phoenix AZ
I have Motul motorcycle oils that I bought in 1993 that I am currently running in my 08' CBR1000RR. The bike is running fine and dandy and dangerously fast.

Top
#1253247 - 10/08/08 08:31 PM Re: Does oil degrade with time? [Re: azsynthetic]
Yary Offline


Registered: 09/26/07
Posts: 89
Loc: CA
I have an opened bottle of RL that has been sitting for about a year. Today I noticed yellow streaks (like sweat off the cap) outside of the bottle (a very thin film). Could that be the residue from the time I poured the oil?
Is the oil still good?

Top
#1253251 - 10/08/08 08:36 PM Re: Does oil degrade with time? [Re: Yary]
ThirdeYe Offline


Registered: 02/23/07
Posts: 8113
Loc: Grand Rapids, MI
Probably residue that was along the top of the threads where the cap screws on, that dripped down over time. I keep a lot of old oil bottles from my oil changes, and once in a while you get that happening. On older bottles of Valvoline, the cap & tamper-proof ring likes to become discolored once the bottle is opened and poured. I'd say it's still good.
_________________________
07 Honda Accord - 587k - Pennzoil Platinum 10W-30/Fram Ultra

Top
#1253274 - 10/08/08 09:17 PM Re: Does oil degrade with time? [Re: ThirdeYe]
TallPaul Offline


Registered: 10/22/03
Posts: 13124
Loc: By Detroit
Don't throw it out. I would just use it, but if you want to call Redline the chemist will assure you it is okay (assuming it is, which is a very good assumption).

I once called Redline because the ATF I bought had a horrible odor, they checked the production code off the bottle and said yes this one is stinky from the seal condition used and that it is fine.
_________________________
The masses, thirsting for convenience, unwittingly dig the grave of the automobile as we knew it. The industry already has one foot in that grave.

Top
#1253280 - 10/08/08 09:22 PM Re: Does oil degrade with time? [Re: ThirdeYe]
demarpaint Offline


Registered: 07/03/05
Posts: 28274
Loc: NY
I'm running Mobil 1 10W-30 in the Lawn Mower that is API SE rated I think, no problems, I have 2 qts left and will use them next year. They were laying in a box I found when cleaning up the garage.

Frank D
_________________________
God Bless Our Troops


Top
#1253547 - 10/09/08 08:47 AM Re: Does oil degrade with time? [Re: azsynthetic]
ryan2022 Offline


Registered: 06/05/06
Posts: 1457
Loc: Peterborough
That is a NASTY NASTY bike. My old boss has a slightly older version. I've heard "stories". Nice bike!
_________________________
2006 Toyota Corolla CE 5w30 Synthetic


Top
#1253594 - 10/09/08 09:49 AM Re: Does oil degrade with time? [Re: pioneer]
Hokiefyd Offline


Registered: 06/24/04
Posts: 14505
Loc: Top of Virginia
 Originally Posted By: pioneer
I have always wondered if the 3 month recommendation was clever marketing years ago that has turned into "fact".


Some of it, yes. I believe it was Jiffy Lube who coined the 3 months or 3,000 miles mantra, back in the early 1960s (I did a report on this for work a while ago, and I don't recall the exact date). Anyway, sure, they were trying to get business.

But on the other side of that, yesterday's oils were very crude, so to speak, compared with today's oils. Sludge was not uncommon, even in "well-maintained" engines. Yesterday's engines, also, were much harder on oil than today's engines are, what with straight-cut gears in the oil pumps, solid lifter and flat tappet valvetrains, etc.

Today's oils are much better, and today's engines are much easier on oil.

Top
#1253599 - 10/09/08 09:56 AM Re: Does oil degrade with time? [Re: pioneer]
eddiedz Offline


Registered: 09/07/08
Posts: 127
Loc: Saint John, NB
 Originally Posted By: pioneer
This may be a dumb question, but one that I have never really thought about and I'm sure someone can explain to me. Why are OCIs based on time as well as miles. Does the oil degrade while sitting in the engine unused over time?


in terms of "time" and disregarding "miles". you can safely keep oil in the engine for 6-12months. i wouldnt go longer then 12months with a synthetic oil and no longer then 6 months with a dino. this also depends on your driving style and conditions and climit. for me, i will be going every 6months(which will be probably less then 5,000 miles)

the whole "3 month" story is total [censored]. maybe oil back in the days like 15yrs ago needed to be changed every 3 months yes, but not now-a-days.


Edited by eddiedz (10/09/08 09:57 AM)

Top