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My dealer sad for me to use only 10/60. But Castrol has a new oil that is 0W30. Isn't it better than 10/60?? Why we can't use this type of oil only 10/60. The viscosity of 0/30 is higher.
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Fernando,
DO NOT put 0W30 into your engine. You have it backward. 0W30 is LOWER viscosity than 10W60. The higher the number, the thicker the oil.
The first number is the "cold" viscosity and the second is the "hot" viscosity, compared to straight-weight oils. 10W40, for example, acts like straight 10W when cold, and like straight 40W when warm. This means that, when cold, 0W30 performs like straight-weight 0W. I have never seen straight 0W, at least not as a motor oil that I know of, but it can't be much thicker than water. I can't imagine an engine that's designed for 10W60 would get along very well with it.