why

The selection of engine oil grade, such as 0W-26 instead of 0W-20, is a decision typically based on factors beyond simply deviating from the vehicle manufacturer’s initial recommendation. Engine oil grades are defined by their viscosity at different temperatures; the “0W” indicates cold-weather performance, while the second number (20 or 26 in this case) specifies the oil’s viscosity at operating temperatures. A higher number suggests a more viscous oil at high temperatures.

The perceived benefit of using a slightly more viscous oil (like 0W-26) often revolves around mitigating potential issues in older engines or engines operating under severe conditions. For instance, an engine with higher mileage might exhibit increased bearing clearances, leading to lower oil pressure with a thinner oil. A more viscous oil can help maintain adequate oil pressure and reduce oil consumption in such cases. Operating conditions such as frequent towing, high ambient temperatures, or aggressive driving styles can also warrant a slightly thicker oil to provide enhanced protection against wear. Furthermore, some aftermarket oil formulations might intentionally target a viscosity slightly outside the standard grade to achieve specific performance characteristics or meet particular industry specifications.

Read more