heroblob, i was lead to believe that 15/50 was for use primarily in hot countries? Is this true, and if so does anyone know why the mille's require it?
is it specified for the italian market and the handbook is just translated included in this:dunno
heroblob, i was lead to believe that 15/50 was for use primarily in hot countries? Is this true, and if so does anyone know why the mille's require it?
is it specified for the italian market and the handbook is just translated included in this:dunno
Joined Jan 2008
600 Posts | 0+
Essex
Here is an explanation for the numbers.
15/50 multi grade oil
the 15 means that at a given industrial standard low temp (cant remember what temp the oil industry uses) the oil in question will have the same viscosity as a single grade oil of 15 viscosity.
the 50 means that the same multi grade oil will have the same viscosity as a single grade oil of 50 viscosity at an industrial standard high temp.
this is achieved by adding additives to the oil.
a single grade oil of 15 viscosity will have a much lower viscosity at the higher standard temp than the multi grade thus giving less lubricity.
I believe there is more to it than just do you live in a hot country or cold. in the hand book for my car it does state that some countries (very cold), should use lower viscosity oils ie: 0/50 instead of 20/50 this i believe is to improve cold starting by lowering the cranking resistance caused by the oils higher viscosity.
however, i don,t believe this country gets cold enough to worry about, manufacturing processes may have an effect as well. some manufacturers may require a higher/lower viscosity due to there manufacturing tolerances.
hope this helps.
15/50 multi grade oil
the 15 means that at a given industrial standard low temp (cant remember what temp the oil industry uses) the oil in question will have the same viscosity as a single grade oil of 15 viscosity.
the 50 means that the same multi grade oil will have the same viscosity as a single grade oil of 50 viscosity at an industrial standard high temp.
this is achieved by adding additives to the oil.
a single grade oil of 15 viscosity will have a much lower viscosity at the higher standard temp than the multi grade thus giving less lubricity.
I believe there is more to it than just do you live in a hot country or cold. in the hand book for my car it does state that some countries (very cold), should use lower viscosity oils ie: 0/50 instead of 20/50 this i believe is to improve cold starting by lowering the cranking resistance caused by the oils higher viscosity.
however, i don,t believe this country gets cold enough to worry about, manufacturing processes may have an effect as well. some manufacturers may require a higher/lower viscosity due to there manufacturing tolerances.
hope this helps.
