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Brookfield AMETEK

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)

* While a particular model/version may be used as an example in this method, any current or past model/version from the same series may also be used. Please consult a sales associate to discuss the most current instrumentation and software available.

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 25C 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 25C.

The Figure 1 graph shows relatively constant viscosities for both motor oils at 25C 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.