Why does oil pressure sometimes change right after converting to Elite?
ExxonMobil: Lisa, oil pressure is directly proportional to oil viscosity. Accordingly, your oil pressure using Exxon Elite will change to the extent that its viscosity is different from the viscosity of the oil you were previously using. For example, if you were previously using an SAE 50 weight monograde like Aeroshell W 100, your oil pressure on start up will decrease because Elite is a 20W-50 multigrade and is thinner at ambient temperature. At operating temperature, your oil pressure with Elite may be slightly higher than your oil pressure was with Aeroshell W 100 because Elite is slightly thicker at operating temperature.
