- Joined
- Jan 22, 2019
- Posts
- 4,284
- Reaction score
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- Location
- Cheyenne, WY
- Ram Year
- 2018 2500
- Engine
- 6.7 CTD
In a 5W-30 for example, the number before the W describes the viscosity of the oil at low temperatures.
The lower the number, the thinner the oil and the better the oil's cold temperature/ cold start performance.
The number after the W describes how thick the oil is at the engine's normal operating temperature.
The lower the number, the thinner the oil and the better the oil's cold temperature/ cold start performance.
The number after the W describes how thick the oil is at the engine's normal operating temperature.