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#4573522 - 11/14/17 08:07 AM oil life.. Additive depletion or contamination?
ZZman Offline


Registered: 03/17/08
Posts: 5796
Loc: Michigan
What typically kills motor oil over time, contamination or additive depletion?

Do most of the additives get used up or just some? Do some never change over time?
_________________________
2003 Mercury Grand Marquis. Rotella T6 Multi-Vehicle oil
2008 Sebring Hardtop convertible. Rotella T6 Multi-Vehicle oil
2006 Kawasaki Vulcan 900 LT. Amsoil Metric 10w-40

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#4573537 - 11/14/17 08:24 AM Re: oil life.. Additive depletion or contamination? [Re: ZZman]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1141
Loc: Winchester, Indiana
Additive depletion is accelerated by trying to neutralize contamination. SO both!

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#4573545 - 11/14/17 08:31 AM Re: oil life.. Additive depletion or contamination? [Re: ZZman]
BrocLuno Offline


Registered: 09/06/15
Posts: 5528
Loc: Kalifornia Kollective
Depends on the engine...

Worn engine with blow-by, it is thickening of oil and TBN depletion due to trying to neutralize acid formation.

New engine, it is either shear, or AW depletion. But the later can be tricky because AW compounds form over time and are unique the engine. So as long as the TBN remains tolerable and the oil is not thickening, it can go a long ways. We have a member here with 62,000 miles on original fill of Amsoil with by-pass filtration and top-ups when he changes filters.

Alcohol and GDI engines, or old carb'd engines out of spec can have fuel dilution and that is a real issue ...
_________________________
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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#4573558 - 11/14/17 08:40 AM Re: oil life.. Additive depletion or contamination? [Re: ZZman]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Depends... UOA can tell you.
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

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#4573757 - 11/14/17 12:20 PM Re: oil life.. Additive depletion or contamination? [Re: ZZman]
rideahorse Offline


Registered: 01/01/15
Posts: 91
Loc: Charles City, Iowa
If syn oil and by pass filters are so good why do they need to have oil added to them. My 200,000 mile Edge that has lived on dino 15w-40 diesel oil still doesn't have to have anything added to it in 6,000 oil changes.

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#4573814 - 11/14/17 01:28 PM Re: oil life.. Additive depletion or contamination? [Re: rideahorse]
Bailes1992 Offline


Registered: 03/10/17
Posts: 119
Loc: South Wales, UK
Originally Posted By: rideahorse
If syn oil and by pass filters are so good why do they need to have oil added to them. My 200,000 mile Edge that has lived on dino 15w-40 diesel oil still doesn't have to have anything added to it in 6,000 oil changes.


Oil top ups WHEN the filters are changed!

I'd love to try a bypass filtration system myself but don't do enough mileage on my own cars and my Focus is a company car.
_________________________
'13 Suzuki Jimmny - '16 Dacia Duster 1.5DCi 4WD
'96 LR Defender 300TDi - '12 BMW 320d

Engine Oil - Fuchs Titan XTL GT1 5w40
Gearbox Oil - Fuchs Sintofluid 75w80
Diff Oil - Fuchs Sintopoid 75w90

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#4573828 - 11/14/17 01:57 PM Re: oil life.. Additive depletion or contamination? [Re: rideahorse]
tig1 Offline


Registered: 01/03/09
Posts: 13661
Loc: Illinois
Originally Posted By: rideahorse
If syn oil and by pass filters are so good why do they need to have oil added to them. My 200,000 mile Edge that has lived on dino 15w-40 diesel oil still doesn't have to have anything added to it in 6,000 oil changes.


My three Ford Duratech I-4 engines that I have owned in the last 12 years, perhaps like yours, have had 0-20 M1 in them for 10K OCIs and use no oil at all. Last time I checked I have put over 400K with 20wt synthetic oil on them.
_________________________
2007 Ford Fusion 227,000 miles
M1 0-20 EP
2017 Ford Fusion 49K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters


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#4575175 - 11/15/17 03:51 PM Re: oil life.. Additive depletion or contamination? [Re: ZZman]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1141
Loc: Winchester, Indiana
My Fusion 2.5 (essentially same as tig's) has gone nearly 100k on 6 oil changes under my ownership... and I haven't had to add an ounce of oil during any OCI. 0W20/5W20 PP and PUP during this time. So there's two major oil companies and three formulations that work just fine.

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#4575581 - 11/15/17 10:18 PM Re: oil life.. Additive depletion or contamination? [Re: rideahorse]
BrocLuno Offline


Registered: 09/06/15
Posts: 5528
Loc: Kalifornia Kollective
Originally Posted By: rideahorse
If syn oil and by pass filters are so good why do they need to have oil added to them. My 200,000 mile Edge that has lived on dino 15w-40 diesel oil still doesn't have to have anything added to it in 6,000 oil changes.


Because they change filter media and that means a qt of make-up oil. They also sample for UOA's, so that needs some make-up oil too.
_________________________
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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