Which is the better grease for electric motors. Both grease for life applications and applications that require a service frequency.

Good Day Dinslage,
The Chevron SRI Poly Urea has been around for a lot longer than the Mobil Polyrex Poly Urea but they are both designed for the same types of application. Ther are targeted at the EM market. The Shell Dolema is another very similar product. South West Greas Research also has a Poly Urea for the same application. Technically I don't think you'll see much difference in the "standard" bench testing results.
They are all good products, we happen to be using the Polyrex, in part because of avaliability.

regards.....