Regarding 5w30 oil viscosity, is the following true? ?

Question

when you start your engine the viscosity index is 5, and as you approach the full operating temperature the viscosity modifiers thicken the oil to a 30 viscosity value. which would mean that if i am driving a short trip the oil viscosity value might only thicken to a 20, i've read that it takes approx. 20 mintes for the oil to reach its full viscosity value, 30 in my case. thanks everybody

Answer 1

Multigrade oils typically begin as base oils, such as 10W. Then viscosity-index modifiers (polymers) are added in an effort to stabilize the viscosity. This allows a 10W40 oil to flow like a 10W at cold temperatures and a 40W at higher temperatures. In other words, multigrade oils are formulated to pass viscosity tests across a range of weights. For example, 10W30 meets the requirements for 10-weight at cold temperatures and 30-weight at high temps.

Answer 2

This is true...it's heat activated

Answer 3

the advantage of the thinner oil is that oil pressure and flow will reach the upper end faster, decreasing the amount of wear to related parts. also the thinner oil is advantageous to you by decreasing the amount of work that the engine has to do to get the oil to circulate. the oils viscosity should not change that fast really, but  i am truly unsure what your question is. the oil will thicken to its needed level.

Answer 4

It is just the opposite.  The oil is thicker when it is cold.