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#3692638 - 04/08/15 12:55 PM longitudinal oil studies?
GS1000S Offline


Registered: 04/08/15
Posts: 6
Loc: ID USA
Have any unbiased longitudinal studies been performed on the cost-benefits of synthetic oils versus premium non-synthetic motor oils? I'm trying to justify why I would pay up to 3X more for a product and would like to see an unbiased objective study over time.

thanks, Pat

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#3692645 - 04/08/15 01:03 PM Re: longitudinal oil studies? [Re: GS1000S]
Burt Offline


Registered: 01/08/09
Posts: 1311
Loc: texas
"longitudinal" - big word. By inspection, the primary benefit of synthetic oils are long OCI's, not greatly reduced wear or extended engine life. So maybe if you factor in labor cost or opportunity cost of you time, you can justify it by having fewer changes. Otherwise why would someone put a lot of effort to document what is obvious?
_________________________
2011 RX350 53k miles
2015 Fiesta SFE eco-boost 24k miles

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#3692676 - 04/08/15 01:27 PM Re: longitudinal oil studies? [Re: GS1000S]
HerrStig Offline


Registered: 08/24/11
Posts: 9560
Loc: Boston, MA
Why buy radial tires, there are probably still some bias plies around.

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#3692773 - 04/08/15 02:51 PM Re: longitudinal oil studies? [Re: GS1000S]
WobblyElvis Online   content


Registered: 09/23/14
Posts: 1355
Loc: Toronto Canada
There are no motor oil studies that answer the question. All we can do is go by the numbers we find in the numberous UOA's we see on sites like this.

My own experience suggests a cheap synthetic lasts much longer than a conventional oil and when I factor in the cost of labour, it is most cost effective to use a cheap group III synthetic and run the oil 10,000 plus.

The choice is yours.

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#3692904 - 04/08/15 05:25 PM Re: longitudinal oil studies? [Re: GS1000S]
CT8 Offline


Registered: 10/09/14
Posts: 11025
Loc: Idaho
Syn oil has certain benefits,if you use the benefits, then syn oils are worth the price.
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

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#3712343 - 04/27/15 06:27 AM Re: longitudinal oil studies? [Re: CT8]
Ducked Offline


Registered: 10/25/12
Posts: 4395
Loc: Taiwan
http://www.bobistheoilguy.com/used-oil-analysis-how-to-decide-what-is-normal/

Its on the home page. Very good article, and I think the only actual evidence I've seen on this question.

IIRC the micro analysis example, (IIRC there's no relevant macro-analysis example) which I take to be a longitudinal study, found no significant benefit from synthetic oil at a 5K OCI.

One might reflect on WHY there isn't more evidence available (assuming there isn't).

It wouldn't be hard for an oil company to sponsor, say, the DHL delivery fleet and get loads of data on the operational difference between running a synthetic and a mineral oil, but if they have, AFAIK they've kept it quiet.

Could it be that facts and marketing don't mix?

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#4773988 - 06/01/18 12:53 AM Re: longitudinal oil studies? [Re: GS1000S]
BrocLuno Offline


Registered: 09/06/15
Posts: 5528
Loc: Kalifornia Kollective
There are no professional papers I have ever come across that say synthetic oils actually lubricate better in moderate temperature environments. Very cold - yes. Very hot - yes. But, OTR trucks regularly run 1,000,000 miles on conventional oil regimens.

Synthetics were developed for other reasons than pure lubricating ability ...
_________________________
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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#4782945 - 06/10/18 10:36 AM Re: longitudinal oil studies? [Re: BrocLuno]
CT8 Offline


Registered: 10/09/14
Posts: 11025
Loc: Idaho
Originally Posted By: BrocLuno
There are no professional papers I have ever come across that say synthetic oils actually lubricate better in moderate temperature environments. Very cold - yes. Very hot - yes. But, OTR trucks regularly run 1,000,000 miles on conventional oil regimens.

Synthetics were developed for other reasons than pure lubricating ability ...
Oil keeps the parts separated. Syn of conventional what ever else, why would the kind of base oil matter if the parts are separated. Yes we can add cold ,Hot Longer possible life etc but that is another discussion. Marketing works and it works well.
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

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#4784602 - 06/12/18 07:38 AM Re: longitudinal oil studies? [Re: GS1000S]
JAG Offline


Registered: 10/23/05
Posts: 4841
Loc: Fredericksburg, VA

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