GMC Envoy Oil, Fluid, and Additive

General information on engine oil, including selection recommendations.

Lake Speed Jr., from Driven Racing Oil, answers the question "what viscosity grade should I run". He explains what viscosity really means and some key factors to keep in mind when selecting the right viscosity grade for your engine and application.

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

Tim M. has tried to stay true to the vintage route, but sometimes, exceptions must be made. For example, the original oiling system's paper element and canister are functional, but an upgraded system will be more reliable.

Lake Speed Jr., from Driven Racing Oil, discusses how to choose the motor oil with the right amount of zinc for your vehicle's unique needs.

Learn the benefits and effects of ethanol in gasoline and what to do to prevent issues from ethanol on your fuel system. Find out more on ethanol warning labels.

Learn how to replace a fuel sending unit. Our fuel gauge sending unit guide and installation video covers all you need to match your fuel sender and gauge.

In this Tech Tip, John offers up a couple solutions to a somewhat common problem of fuel expansion on the older vehicles.