Brookfield Engineering

Motor Oil

Laboratory Viscometer Application Data Sheet


Test Equipment:

  • Instrument: Viscometer or Rheometer
  • Spring Torque Range: RV
  • Spindle: YULA-15E
  • Accessories: Enhanced UL Adapter, TC-502P Programmable, Refrigerated Bath
  • Speed, rpm: 10, 20 and 30 rpm (10W-40 motor oil); 5, 10 and 15 rpm (20W-50 motor oil)

The Enhanced UL Adapter may be used with various Brookfield Viscometers or Rheometers. In our example, we used a Brookfield RVDV-III Ultra, 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, below:

Figure 1: Motor Oils at 25°C.

The Figure 1 graph shows relatively constant viscosities for both motor oils at 25°C over the speed ranges tested. The 10W-40 motor oil viscosity (Red Data) was 179 cP while the 20W-50 motor oil viscosity (Black Data) was approximately 337 cP.