The difference is in operating temperature viscosity. The number before the ‘W’ is the cold crank/cold pump viscosity designation. The W stands for winterized and the number after the W is the operational viscosity. The engine manufacturer engineers figured out the proper viscosity to recommend. The 20 is thinner then the 30. Its important you follow their recommendations. .
Answers & Comments
Answer:
1/2 or one-half
Correct me if I'm wrong
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Answer:
The difference is in operating temperature viscosity. The number before the ‘W’ is the cold crank/cold pump viscosity designation. The W stands for winterized and the number after the W is the operational viscosity. The engine manufacturer engineers figured out the proper viscosity to recommend. The 20 is thinner then the 30. Its important you follow their recommendations. .