Brookfield Engineering

Lubricating Oil

Laboratory Viscometer Application Data Sheet


Lubricating Oil is a general purpose petroleum product used to lubricate moving parts or to coat and prevent rust on various objects.

Test Equipment

  • Instrument: Standard Viscometer or Rheometer
  • Spring Torque Range: LV
  • Spindle: YULA-15E
  • Accessory: Enhanced UL Adapter or "ULA-EY" TC-502P Programmable Refrigerated Bath
  • Speed, rpm: 5, 10 and 15 rpm

The Enhanced UL Adapter may be used with various Brookfield Viscometers or Rheometers. In our example, we used a Brookfield LVDV-III+, with Rheocalc v3.1 software for automated instrument control and data acquisition. Our test temperature of 25°C was maintained by direct immersion of the Enhanced UL Adapter sample chamber into a TC-502P Programmable Refrigerated Bath. Representative data from the analyses are shown in Figure 1:

Figure 1: General Purpose Lubricating Oil at 25°C.

We tested the sample at 5 rpm, increased the speed to 10 rpm and then to 15 rpm. We then decreased the speed to 10 rpm and then back to 5 rpm. This type of test method is referred to as an "up-down speed ramp". The Figure 1 graph shows a relatively constant viscosity 39.1cP to 39.7cP over the speed range tested. This type of flow behavior is called "Newtonian".