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MainpageLubricantsHydraulic oilsSHELL Tellus S 32 20 lit.

SHELL Tellus S 32 20 lit.

VTSZ: 27101983

Performance Features

• Outstanding oil life

Typically two to four times that of many

anti-wear hydraulic oils.

• Peace of mind

Through longer component life and

outstanding operation.

• Lower ecological impact

Zinc and chlorine free formulations unique

to Shell.

Many piston pumps utilise brass components

and in particular brass slippers which fit

onto the heads of steel pistons and slide

on a steel surface. These bronze slippers

are usually the items of wear and an oil’s

performance is normally evaluated by the

weight loss of bronze and the loosening of

the fit on the pistons, referred to as ‘slipper

fit’. Many anti-wear hydraulic oils permit

either considerable wear, if the pumps are

highly loaded, or in extreme cases result

in pump failure by the slippers detaching

themselves from the pistons.

Shell Tellus Oils S give extremely low wear

rates of the brass components in the Denison

P-46 pump; the most severe standard

industry test for this performance aspect.

FZG gear rig test

• Gear rig tests are sometimes used for

evaluating hydraulic oils and the best

known is the FZG rig (Forschungsstelle für

Zahnräder und Getriebebau – Technical

Institute for the study of Gears and Drive


The rig utilises a pair of specially

designed case-hardened spur gears

and, for hydraulic oils, it is run at a

pitch line velocity of 8.3 m/s, with an oil

temperature of 90°C. The test is carried

out by running the gears for 15 minutes

in the test oil the weighing the gears,

after which the machine is reassembled

and the load increased. This procedure is

carried out until at least 10mg weight loss

is recorded between the stages, or until

the gears appear scuffed.

Shell Tellus Oil S achieves an 10th Fail stage.

Thermal stability

• An oil’s thermal stability is the measure

of its ability to resist degradation and

attack of metals at high temperature. An

accelerated test for this is to maintain the

oil at a temperature of 135°C for one

week in the presence of steel and copper.

• Tests with Shell Tellus Oils S show

negligible weight changes of the metals,

whilst the steel remains bright and there

is only slight discolouration of the copper;

many anti-wear hydraulic oils cause the

copper to become black.

Hydrolytic stability

• Hydrolytic stability indicates the extent

to which an oil tends to develop acidity

in the presence of copper and water at

high temperatures. The test for hydrolytic

stability not only evaluates the acidity

developed in the water present, and is

also regarded as giving an indication

of an oil’s suitability for use with copper

alloy parts. It is a stringent test in which

many good anti-wear hydraulic oils

perform poorly, but in which Shell Tellus

Oils S give outstanding results.

• In the hydrolytic stability test, oil, water

and copper are sealed in a bottle and

rotated for 48 hours in an oven at 93°C.

At the end of the test, the oil and water

layers are separated and the insolubles

weighed. The change in weight of the

copper is also measured and the oil

viscosity and acid numbers of both the oil

and the water are determined.

• Results of the tests with Shell Tellus Oils

S are excellent. They show negligible

copper weight loss and very small

changes in acid values of oil and water.

Shell Tellus Oils S have been tested and

approved to exceed the following industry


Denison HF-0


Vickers M-2950-S (Mobile systems)

I -286-S (Industrial systems)

Cincinnati Milacron P68, P69, P70

ISO 11158

Price: 33.250 Ft
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