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First number is the weight, the higher the number the heavier the oil, viscosity. 10w is thinner than 20w oil and so on, requirements are set by manufacturer, and changed by user dependent upon usage. i.e. car specs asking for 10w-30 oil but you are in -30f weather, you may use 5w-30 until temps rise, or if you are pulling trailer and in very hot climate, you might change to a 20w-50 oil to keep the manufacturers viscosity rating then switch back before winter. The second number is the lubricating properties, a 10w-30 is a 10 weight oil with lubricating properties of a 30w oil, additives to give a wider temp range of usage. As a matter of opinion, I personally stay away from the 0w-xx or the 5w-xx synthetic oils and use 10w-40 full synthetic in my daily drivers. We have extreme cold here in winters, -30f - -45f and 10w and over petroleum based oils do not start very well. My Yamaha requires 20w-40 and I use the Yamalube oil. Whatever yo do, do not ride your air cooled bike in heavy traffic during summer months, get that baby out on the road to stay cool...

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Q: Whats the differences in oils weights?
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