Recent Topics
Meguiar's Liquid Cleaner Wax $5 WalMart, Amazon
by The_Cams. 09/20/18 08:42 PM
Winter oil recommendation
by Neptune. 09/20/18 08:27 PM
M1 0W-40
by CT8. 09/20/18 07:37 PM
What controls timing on my 08 Honda?
by Roland. 09/20/18 07:23 PM
The real culprit about 18k
by Ablebody. 09/20/18 06:04 PM
How not to drain a pool.
by StevieC. 09/20/18 05:50 PM
Tranny fluid in Old Ferguson Tractor ?
by Rudy1999 250. 09/20/18 03:39 PM
New (old) car inbound
by BeerCan. 09/20/18 02:42 PM
Ford AWD PTU fluid always black
by Raven. 09/20/18 02:34 PM
PC not charging
by sleepery. 09/20/18 01:53 PM
Can alternators make noise?
by Benzadmiral. 09/20/18 01:21 PM
Pr 1970 Superbirds For sale - Barn Find
by user52165. 09/20/18 12:32 PM
Fram Ultra Air Filters
by StevieC. 09/20/18 12:20 PM
Change oil filter or not. Very low miles
by Martin10. 09/20/18 11:37 AM
Toslink optical audio cable (plastic) experience
by ffhdriver. 09/20/18 11:30 AM
ACEA A5/B5 REQUIREMENTS
by Kjmack. 09/20/18 10:56 AM
Carolina Reaper hot peppers
by gman2304. 09/20/18 09:54 AM
Newest Members
Direct_Rejection, donatom, Sylent_Snyper, Ajizzle, nicknak
66033 Registered Users
Who's Online Now
122 registered members (2009Edge, 14Accent, 08z06, 14 invisible), 1,438 guests, and 41 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics290,732
Posts4,849,321
Members66,033
Most Online3,590
Jan 24th, 2017
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
Mixed and Boundary Lubrication and GDI/TGDI UOAs #4533004
10/03/17 01:17 PM
10/03/17 01:17 PM
Joined: Apr 2012
Posts: 9,365
Kendall, FL
wemay Offline OP
wemay  Offline OP
Joined: Apr 2012
Posts: 9,365
Kendall, FL
Taking into consideration that a vast majority of Turbo Direct Injection and Direct Injection vehicles dilute motor oil, and that most UOA of said applications still show low wear metal count (ppm), can we assume that additives have improved to such levels as to becoming the reason why? In other words, Mixed and Boundary films becoming more important in the grand scheme than Hydrodynamic Boundary initial protection?




'18 KIA Sportage LX AWD: Mobil Super Synthetic 10w30
'13 Hyundai Santa Fe Sport 2.0T: EDGE 5w30
Re: Mixed and Boundary Lubrication and GDI/TGDI UOAs [Re: wemay] #4533357
10/03/17 09:00 PM
10/03/17 09:00 PM
Joined: Sep 2015
Posts: 2,259
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,259
Malaysia
In engine oil lubrication, corrosion wear (chemistry) matters and adhesion/abrasion wear (physics) doesn't matter , in relative terms.

Modern day manufacturing methodology , materials technology and engine designs has shifted engine lubrication regimes on the Stribeck curve to the right towards EHD/Hydrodynamic lubrication regimes, well away from boundary and mixed lubrication regimes , hence further propensity for reducing adhesion/abrasion wear.

In relation to thicker engine oil, physics shows a thinner MOFT in thinner oil (of similar additive package) can never produce lesser adhesion/abrasion wear , as is often touted on this board......... being confused with 'wear' per se.

But a specific modern day additive package (chemistry) having relatively extra-ordinary efficacy in reducing corrosion engine wear, and to a lesser extent its AW efficacy in reducing adhesion/abrasion engine wear (in boundary lubrication regimes) ..........
can drastically change the overall engine wear pattern and proportions.......
vis-a-vis a weaker additive package , never mind its physics in MOFT.

The same is not true in gear oil lubrication system, and probably a hydraulic system exhibiting insignificant and minimal corrosion wear phenomenon.

JMHO.

Last edited by zeng; 10/03/17 09:05 PM.

BOB IS THE OIL GUY® Powered by UBB.threads™