Standard Test Method for
Predicting the Borderline Pumping Temperature of Engine
Oil1

This standard is issued under the fixed designation D 3829; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This test method covers the prediction of the borderline
pumping temperature (BPT) of engine oils through the use of
a 16-h cooling cycle over the temperature range from 0
to −40°C.

1.2 Applicability to petroleum products other than engine
oils has not been determined.

1.3 This test method uses the millipascal (mPa·s), as the unit
of viscosity. For information, the equivalent centipoise unit is
shown in parentheses.

1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Terminology

2.1 Definitions:

2.1.1 apparent viscosity—the determined viscosity obtained
by use of this test method.

2.1.2 Newtonian oil or fluid—an oil or fluid that at a given
temperature exhibits a constant viscosity at all shear rates or
shear stresses.

2.1.3 non-Newtonian oil or fluid—an oil or fluid that at a
given temperature exhibits a viscosity that varies with changing shear stress or shear rate.

2.1.4 shear rate—the velocity gradient in fluid flow. For a
Newtonian fluid in a concentric cylinder rotary viscometer in
which the shear stress is measured at the inner cylinder surface
(such as the apparatus being described), and ignoring any end
effects, the shear rate is given as follows

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