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The Mercedes OM646LA Wear Test at
SwRI evaluates a lubricants ability to prevent
engine wear |
Mercedes OM646LA wear test method CEC
L-99-08 is offered by Southwest Research Institute (SwRI) to evaluate engine oil
performance with regards to low-temperature lubricant thickening and
component
wear under severe operating conditions.
ACEA 2008 Specifications
The
Mercedes OM646LA wear test is part of ACEA 2008
specifications:
|
Gasoline and Diesel Engines |
Gasoline and Diesel Engines
with Aftertreatment Devices |
Global |
A1/B1-08
A3/B3-08
A3/B4-08
A5/B5-08 |
C1
C2
C3
C4 |
E4
E6
E7
E9 |
Field Service Simulated
The CEC-L-99-08 test simulates diesel
engine wear in European climates.
CEC L-99-08
Test Fixtures
A Mercedes 2.2-liter
common rail, inline 4-cylinder, turbocharged, direct-injected automotive
diesel engine (OM646LA) mounted on an engine dynamometer test stand is
used for this test.
CEC L-99-08
Test Parameters
The 300-hour,
15-phase test cycle utilizes idle, part-load, and full-load operating
conditions along with a cold engine soak every hour. Oil additions are
determined by sump oil level.
CEC-L-99-08 Test Part Evaluations
Camshafts, bore, tappets, bearings and
piston rings are measured for wear. Engine oil sump, timing
cover, rocker cover and valve deck are rated for sludge
deposits.
Used Engine Oil Analysis
| Analysis |
Method |
Alternative Method |
Unit |
Fresh Oil |
50H, 100H, 150H, 200H, 250H, EOT |
|
Viscosity @ 40
°C |
DIN
51562-1 |
ASTM D445 |
mm²/s |
x |
x |
|
Viscosity
@ 100 °C |
DIN
51562-1 |
ASTM D445 |
mm²/s |
x |
x |
|
Fuel
content (evaluation up to 350 °C) |
DIN 51380 |
ASTM
D2887 |
%M |
|
x |
|
Metal
Content |
DIN 51
396-1 |
ASTM
D5185 |
mg
/ kg |
|
x |
|
Soot |
DIN 51452 |
- |
%M |
|
x |
|
Nitration |
DIN 51453 |
- |
A/cm |
|
x |
|
Oxidation |
DIN 51453 |
- |
A/cm |
|
x |
|
TAN |
ASTM D
664 |
- |
mgKOH/g |
x |
x |
|
TBN |
DIN
ISO 3771 |
ASTM
D2896 |
mgKOH/g |
x |
x |
Pass/Fail
Criteria
|
Gasoline and Diesel Engines |
|
Properties (unit) |
Limits |
|
A1/B1-08 |
A3/B3-08 |
A1/B4-08 |
A5/B5-08 |
|
Cam wear outlet
(μm) |
£
140 |
£
140 |
£
120 |
£
120 |
|
Cam wear intlet
(μm) |
£
110 |
£
110 |
£
100 |
£
100 |
|
Cylinder wear
(μm) |
£
5.0 |
£
5.0 |
£
5.0 |
£
5.0 |
|
Bore polishing
(%) |
£
3.5 |
£
3.5 |
£
3.0 |
£
3.0 |
|
Tappet wear
inlet (μm) |
Report |
Report |
Report |
Report |
|
Tappet
wear outlet (μm) |
Report |
Report |
Report |
Report |
|
Piston
cleanliness (merits) |
Report |
Report |
Report |
Report |
|
Engine
sludge avg. (merits) |
Report |
Report |
Report |
Report |
|
Gasoline and Diesel Engines
with Aftertreatment Device |
|
Properties (unit) |
Limits |
|
C1 |
C2 |
C3 |
C4 |
|
Cam wear outlet
(μm) |
£
120 |
£
120 |
£
120 |
£
120 |
|
Cam wear intlet
(μm) |
£
100 |
Report |
£
100 |
£
100 |
|
Cylinder wear (μm) |
£
5.0 |
£
5.0 |
£
5.0 |
£
5.0 |
|
Bore polishing
(%) |
£
3.0 |
£
3.0 |
£
3.0 |
£
3.0 |
|
Tappet wear
inlet (μm) |
Report |
Report |
Report |
Report |
|
Tappet
wear outlet (μm) |
Report |
Report |
Report |
Report |
|
Piston
cleanliness (merits) |
Report |
Report |
Report |
Report |
|
Engine
sludge avg. (merits) |
Report |
Report |
Report |
Report |
|
Global |
|
Properties (unit) |
Limits |
|
E4 |
E6 |
E7 |
E9 |
|
Cam wear outlet
(μm) |
£
140 |
£
140 |
£
155 |
£
155 |
*Association des Constructeurs Européens d'Automobiles/European Automobile Manufacturers Association.
For more information about Mercedes OM646LA wear test (CEC
L-99-08) capabilities at SwRI or how you can contract with SwRI,
please contact
Raham
Kirkwood at
rkirkwood@swri.org or (210) 522-5905.
|
|
Contact Information |
|
Raham Kirkwood
Mercedes OM646LA Wear Test
(210) 522-5905
rkirkwood@swri.org |
|
Related Terminology |
|
CEC L-99-08
Mercedes OM646LA Wear Test
ACEA lubricant evaluations
ACEA 2008
specifications
elastomer
compatibility test
lubricant analysis
compatibility of
lubricating oils
standardized lubricant
testing
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Southwest Research Institute® (SwRI®), headquartered
in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied
engineering and physical sciences research and development organization with
12
technical divisions.
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