Lubricant types by color and function

Hello everyone. I've noticed that some people don't offer any benefit to their classmates or colleagues—no useful information—and therefore always try to disrupt any work except to harm people. From this perspective, and since I offer free information based on my experience and relying on available references on this blog, I want to clarify from the outset: anyone who sees any content that infringes on intellectual property rights or belongs to them should simply request its removal via private message as you see below widget.