Use 
Motor Oil is used as a lubricant in internal combustion engines.
Test Equipment 
Instrument: Viscometer or Rheometer 
Torque Range: RV 
Spindle: YULA-15E 

Accessories: Enhanced UL Adapter, TC-550SD Programmable Refrigerated Bath 
Speed: 10, 20 and 30 RPM  (10W-40 motor oil);  5, 10 and 15 RPM  (20W-50 motor oil)

Test Method 
The Enhanced UL Adapter may be used with various Brookfield Viscometers or Rheometers. In our example, we used a Brookfield RVDV3T with RheocalcT 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-550SD Programmable Refrigerated Bath. Representative data from the analyses are shown in Figure 1. 

The Figure 1 graph shows relatively constant viscosity 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.

Figure 1: Motor Oils at 25°C

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