Lubricant Guides

What NLGI numbers actually describe, why thickener type matters more than most buyers expect, and how the Castrol Spheerol range is organised.

Castrol offers several industrial gear oil ranges and they are not interchangeable. Here is how Alphasyn, Optigear and Alpha differ and when each one earns its place.

NSF H1 registration applies to specific products, not to brands. What the category actually means and where Castrol Optileb fits in food and beverage production.

How the Castrol Hyspin range breaks down by ISO viscosity grade and oil type, and how to work out which one your hydraulic system actually needs.