Monounsaturated fatty acids (n-9) can be synthesised by the body and are not considered essential fatty acids, hence there is no adequate or recommended intake limit set. 
Plant sources rich in monounsaturated fatty acids are liquid at room temperature. 
Of the known types in this category, oleic acid accounts for about 92 % of dietary monounsaturated fatty acids. 
Replacing calories from carbohydrates with equivalent calories from monounsaturated fats can reduce mortality risk by 19%. 
Absorption/ Storage/ Excretion
Absorption of mono-unsaturated fatty acids is in excess of 90% in adults and infants. 
Since oleic acid is completely absorbed, very little is actually excreted through urine.