AC Oil, Fluid, and Additive

Learn what gear oils do for your differential and how to choose the best gear lubricant for your application's needs

Learn about how aftermarket transmission coolers can help keep your transmission cool and the different options available for cooling with our expert guide.

Learn about the functionality of key parts in a hot rod air conditioning system for install or diagnosing issues. We cover the condenser, compressor and more.

How does ZDDP or zinc help my engine live longer, what does ZDDP do and why is it important to use ZDDP oil in my engine?

Do I need break-in oil for my engine and why. When should I not use an engine break-in oil? What do I look for when choosing a break-in oil?

Classic cars ran on normal motor oils for decades, so why change now? The answer lies in the evolution of gasoline engines and how motor oil has co-evolved.

OEMs have moved away from flat tappet cams, and so has mainstream motor oil. Find out what you need to know about the best oil for flat tappet cams right here.

Learn the difference between DOT 3 and DOT 4, or DOT 5 and DOT 5.1. Every type of brake fluid has a specific boiling point and water absorbing quality.

Overheating is a major cause of DNFs and damaged engines. We'll go beyond the cooling system for solutions to your overheating issues.

In this Tech Tip, John answers a customer concerns about adding additional drop to his 1960-1972 Chevy truck.