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I’ve used Amsoil 4-Stroke 0W-40 synthetic oil for several years in both CDO and Harley primary drives with wet clutches and it works well at all temperatures (no dragging cold and no slipping hot). As Greg pointed out, unless things get very warm the oil viscosity remains low since the base oil is 0W and the thickener package is not fully recruited until the oil nears 100C. If things do get hot, the resulting higher viscosity oil provides a higher film strength lubricant that can handle higher loads than a 0W oil can. Also as Greg mentioned, the clutch remains dry for prolonged periods. When 0W oil eventually wets the clutch pack, it leaves no sticky residue and does not cause the clutch to drag or slip.


https://www.amsoil.com/p/amsoil-formula-4-stroke-powersports-0w-40-synthetic-motor-oil-aff/


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