Originally Posted by
I-Like-To-Bike
What value is multi viscosity oil over single grade motor oil for use on a chain which does not need to start on a cold morning, nor will heat up enough while riding to make a difference? Why not use a cheaper single grade oil?
The reason I use it is because when changing motor oil, there is always some left in a bottle - which is enough to last a long time.
Also, last time I was looking for some oil, SAE90 and 20w60 cost both around 4 $ per litre.
Both 20w60 and SAE90 are the same as far as bicycle chain lubing goes - whichever one can find cheaper, or more convenient.