Heavy-Duty Diesel Engine Test Category
For API CG-4/CF/CF-2

Requirements

Test Method

Properties

Unit

Limits

1 Test

2 Tests

3 Tests

1. LABORATORY TESTS

1.1 Viscosity Grades

SAE J300

Manufacturer specifies viscosity target within SAE J300 specification

1.2 HEUI Air Entrainment Test ⁽⁴⁾

Aeration, max

% volume

10.0

-

-

1.3 Cummins Bench Corrosion Test ⁽⁴⁾

ASTM D5968

Copper increase, max

ppm

20

No MTAC ⁽¹⁾⁽²⁾

Lead increase, max

ppm

60

Tin increase, max

ppm

report

Copper corrosion rating,
max (D130)

3

1.4 Foam Test ⁽⁴⁾

ASTM D892

Sequence I

mL

10/0 max

No MTAC ⁽¹⁾⁽²⁾

Sequence II

mL

20/0 max

Sequence III

mL

10/0 max

2. ENGINE TESTS FOR API CG-4

2.1 Mack T-8

ASTM D5967

Viscosity increase at 3.8% soot, max

cSt

11.5

12.5

13.0

Filter plugging, differential pressure, max

kPa/(psi)

138(20)

138(20)

138(20)

Oil consumption, max

g/kW-h (lb/bhp.h)

0.304(0.0005)

0.304(0.0005)

0.304(0.0005)

2.2 Caterpillar 1N

Weighted total demerits, max

286.2

311.7

323.0

Top groove fill, max

% volume

20

23

25

Top land heavy carbon, max

%

3

4

5

Oil consumption, max

g/kW-h

0.5

0.5

0.5

Scuffing, piston-rings-liner
Number of tests allowed

none

none

none

Stuck rings

none

none

none

2.3 Roller Follower Wear Test

ASTM D5966

Wear, max

µm (mils)

11.4 (0.45)

12.4 (0.49)

12.7 (0.50)

2.4 Sequence IIIE

ASTM D5533

Hours to 375% viscosity increase, min

hours

67.5

65.1

64.0

2.5 CRC L-38

ASTM D5119

Bearing weight loss, max

mg

43.7

48.1

50.0

Used oil viscosity, cSt greater than SAE J300 lower limit for grade, min

cSt

0.5

0.5

0.5

3. ENGINE TESTS FOR API CF/CF-2

3.1 Caterpillar 1MPC

RR:D02-1320

Weighted total demerits, max

% volume
mm

240

MTAC applies ⁽²⁾

Top groove fill, max

70

Ring side clearance loss, max

0.013

Piston ring sticking

none

Piston ring and liner scuffing

none

Weighted total demerits,
CF-2 max

100

3.2 CRC L-38

ASTM D5119

Bearing weight loss, max

mg

43.7

48.1

50.0

3.3 Detroit Diesel 6V92TA ⁽³⁾

ASTM D5862

Cylinder liner scuffing area, max

%

45

48

50

Average fire ring face distress

demerits

0.23

0.24

0.26

Average 2 & 3 ring face distress

demerits

0.20

0.21

0.22

Broken rings

none

none

none

Cylinder liner port plugging area

Average, max

%

2

2

2

Single cylinder, max

%

5

5

5

(1) Not an ACC Test.
⁽²⁾ MTAC is a statistical method for treating engine test results. Consult your sales representative for further information.
⁽³⁾ This test is not required for API CF.
⁽⁴⁾ This test is not required for CF/CF-2.