Can You Use 5W-30 Engine Oil Instead Of 5W-20?
In the late 1970s, when I first started working on cars and doing engine maintenance, 10W-30 was about the only ...
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Why Heavy-Duty Diesel Engines are Transitioning to Lower Viscosity Oil
In the past, there have been similar shifts in preferred engine oil viscosity grades ... oils in the 1980s from monograde viscosity SAE 30 and SAE 40 to multi-grade viscosity SAE 15w-40.