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oil life.. Additive depletion or contamination? #4573522
11/14/17 09:07 AM
11/14/17 09:07 AM
Joined: Mar 2008
Posts: 5,942
Michigan
ZZman Offline OP
ZZman  Offline OP
Joined: Mar 2008
Posts: 5,942
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
Re: oil life.. Additive depletion or contamination? [Re: ZZman] #4573537
11/14/17 09:24 AM
11/14/17 09:24 AM
Joined: May 2012
Posts: 1,333
Winchester, Indiana
SubieRubyRoo Offline
SubieRubyRoo  Offline
Joined: May 2012
Posts: 1,333
Winchester, Indiana
Additive depletion is accelerated by trying to neutralize contamination. SO both!

Re: oil life.. Additive depletion or contamination? [Re: ZZman] #4573545
11/14/17 09:31 AM
11/14/17 09:31 AM
Joined: Sep 2015
Posts: 5,839
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,839
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.
Re: oil life.. Additive depletion or contamination? [Re: ZZman] #4573558
11/14/17 09:40 AM
11/14/17 09:40 AM
Joined: Aug 2008
Posts: 18,276
Ontario, Canada
StevieC Online content
StevieC  Online Content
Joined: Aug 2008
Posts: 18,276
Ontario, Canada
Depends... UOA can tell you.


'18 Highlander - AMSOIL SS 0w20 / ATF / Severe Gear
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF (R.I.P)
Re: oil life.. Additive depletion or contamination? [Re: ZZman] #4573757
11/14/17 01:20 PM
11/14/17 01:20 PM
Joined: Jan 2015
Posts: 97
Charles City, Iowa
rideahorse Offline
rideahorse  Offline
Joined: Jan 2015
Posts: 97
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.

Re: oil life.. Additive depletion or contamination? [Re: rideahorse] #4573814
11/14/17 02:28 PM
11/14/17 02:28 PM
Joined: Mar 2017
Posts: 149
South Wales, UK
Bailes1992 Offline
Bailes1992  Offline
Joined: Mar 2017
Posts: 149
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
Re: oil life.. Additive depletion or contamination? [Re: rideahorse] #4573828
11/14/17 02:57 PM
11/14/17 02:57 PM
Joined: Jan 2009
Posts: 13,834
Illinois
tig1 Offline
tig1  Offline
Joined: Jan 2009
Posts: 13,834
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 232,000 miles
M1 0-20 EP
2017 Ford Fusion 55K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters

Re: oil life.. Additive depletion or contamination? [Re: ZZman] #4575175
11/15/17 04:51 PM
11/15/17 04:51 PM
Joined: May 2012
Posts: 1,333
Winchester, Indiana
SubieRubyRoo Offline
SubieRubyRoo  Offline
Joined: May 2012
Posts: 1,333
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.

Re: oil life.. Additive depletion or contamination? [Re: rideahorse] #4575581
11/15/17 11:18 PM
11/15/17 11:18 PM
Joined: Sep 2015
Posts: 5,839
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,839
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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