Understanding Viscosity: The First Number Matters When looking at your owner’s manual or browsing the auto parts shelf, the first thing you will notice is a code such as 5W-30 or 10W-30. These systems rely on consistent oil pressure and flow, meaning you cannot simply guess with an older, thicker oil.
2024 GMC Sierra Oil Type Guide: Choosing the Right Viscosity and Certification
This certification ensures that the oil has been rigorously tested in GM engines for performance, cleanliness, and fuel economy. Conventional oil is refined from crude oil and is sufficient for older trucks or drivers with light duty schedules, but it breaks down faster under high heat.
The "W" stands for winter, and the number preceding it indicates how the oil flows when cold. Synthetic blend offers a middle ground, mixing conventional oil with synthetic components to provide better protection at a lower price point than full synthetic.
2024 GMC Sierra Oil Type Guide: Choosing the Right Viscosity and Certification
Always check the oil fill cap or your maintenance booklet for this specific badge to guarantee compatibility with the vehicle’s emission and lubrication systems. A lower number like 5W flows more easily in freezing temperatures, ensuring the engine is protected the moment you turn the key.
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