In this article, we have derived a new method to study the oscillatory and asymptotic properties for third-order noncanonical functional differential equations with both positive and negative terms of the form

$$(p_2(t)(p_1(t)x^{\prime }(t){)}^{\prime }{)}^{\prime }+a(t)g(x(\tau (t)))-b(t)h(x(\sigma (t))=0$$

Firstly, we have converted the above equation of noncanonical type into the canonical type using the strongly noncanonical operator and obtained some new conditions for Property $\overline{A}$. We furnished illustrative examples to validate our main result.