technical rep.

TEST REPORT & LUBRICITY TEST

The test is carried out by applying pressure with a torque wrench on to a test slug against a rotating test ring; whilst the test ring is partially immersed in a lubricant.

The corresponding friction between the test ring and the slug, indicated by a change in load of the drive motor, is a measurement of the lubricant's quality.

The wear scar formed on the test slug also provides a good visual indication, when compared with the datum, of the quality of the tested lubricant.

The object of the test is to determine the effect of pressure on the hardened steel slug with regards to friction and wear whilst using different combinations of base oils.

Test Ring & Test Slug:

Hardened Steel (Surface hardness 786 Vickers or 67 Rockwell approx.)

Ring Speed of:

350 rpm

Load Duration of:

10 seconds where possible

TEST BASE OILS:

Two 20/50W engine oils, Two EP 90 gear oils, and a fully synthetic 20/50W engine oil as reference fluids.

COMPARED WITH:

1) A neat alternative.
2) An additive package.
3) A comparison to other additives.

Lubricity Test Observations and Results

Pressure Applied Approx. 5Ft Lb Per Second
Lubricant		Duration of Test	Wear Scar Length mm	Wear Scar Width mm	Pressure On Lubricant
Base Oil	Additive	Duration of Test	Wear Scar Length mm	Wear Scar Width mm	Breakdown	Seizure
Castro GTX	None	9 sec	6.25	2.75	40	45
Esso EP90	None	12 sec	5.50	2.50	55	60
Duckhams Hypo	None	10 sec	6.50	3.00	45	50
Esso Superlube	None	9 sec	6.90	3.10	40	45
Co-op 20/50	None	8 sec	7.40	3.20	35	40

Castro GTX	15% STP	12 sec	6.00	2.75	45	50
Esso EP90	15% STP	14 sec	5.25	2.25	65	70
Duckhams Hypo	15% STP	11 sec	5.50	3.00	50	55
Esso Superlube	15% STP	12 sec	5.75	2.90	55	60
Co-op 20/50	15% STP	10 sec	5.75	2.90	45	50

Castro GTX	15% Slick 50	10 sec	5.50	2.50	45	50
Esso EP90	15% Slick 50	15 sec	4.75	2.00	70	75
Duckhams Hypo	15% Slick 50	15 sec	4.75	2.00	70	75
Esso Superlube	15% Slick 50	11 sec	5.50	2.50	50	55
Co-op 20/50	15% Slick 50	11 sec	5.50	2.50	50	55

Castrol GTX	10% Molyslip	10 sec	6.00	2.75	45	50
Esso EP90	10% Molyslip	14 sec	5.25	2.25	65	70
Ducjhams Hypo	10% Molyslip	11 sec	5.50	3.00	50	55
Esso Superlube	10% Molyslip	11 sec	5.75	2.90	55	55
Co-op 20/50	10% Molyslip	10 sec	5.75	2.90	45	45

Castrol GTX	5% Activ8	60 sec	2.00	1.00	Not Reached	>120
Esso EP90	5% Activ8	60 sec	1.50	0.50	Not Reached	>120
Duckhams Hypo	5% Activ8	60 sec	2.00	1.00	Not Reached	>120