Lubricant requirements constantly evolve and become ever more challenging. For example, regulatory mandates for improved emissions and fuel economy are driving the use of lighter viscosity finished oils, while at the same time, markets drive for longer oil drain intervals. To meet these requirements, VIIs must deliver robust viscosity control in challenging environments and do so over extended operation.
To assure our products perform, Oronite takes a thorough and rigorous approach to product development testing. Here is one example of how we test our products:
- The traditional way of measuring polymer shear stability has been the 30-cycle injector test, ASTM D6278. In today’s service environment, extended drain intervals are putting heavier loads on oils and demand a more severe shear test. For heavy-duty oils, recognized specifications such as ACEA, Mack EO-N Premium Plus 03, and others, have moved to extended testing in the injector test – increasing the requirements to 90 cycles. Different VII chemistries vary in their response to more severe shearing.
However, through this real-world testing, PARATONE® is well-known to maintain viscosity better under the extended conditions than other brands, even when samples having the same 30-cycle shear stability as PARATONE are tested side-by-side.
Additionally, we rigorously apply industry standard tests to assure robust performance and consistent results:
- Low temperature cranking is measured by the Cold Crank Simulator (CCS). The CCS test simulates the action of the starter motor on an engine. This test is important because the battery and starter motor can overcome only so much resistance and still produce adequate cranking speed at low temperatures.
- Low temperature pumping is measured by the Mini Rotary Viscometer (MRV). Just after a cold start, it is vital that the oil be pumpable from the oil pan to the engine parts. The MRV allows oils to be classified according to their ability to be supplied to the inlet of the engine’s oil pump. Failures can occur because the pump becomes air-locked and delivers no oil, or because the flow rate is too low to maintain adequate oil pressure.
- Low shear oil flow requirements are measured by Kinematic Viscosity. This viscosity measurement predicts the general ability of the oil to move throughout the engine and successfully lubricate critical engine parts.
- The ability of an oil to maintain a minimum viscosity, or film forming capability, under high temperature and high shear conditions are measured by High Temperature/High Shear Viscometer (HTHS). This viscosity measurement is relevant to high-temperature engine performance of multigrade engine oils. It quantifies the shearing potential of polymers used in Viscosity Index Improvers and is generally believed to be indicative of the effective viscosity in high-shear areas of the internal combustion engine under severe operating conditions.
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