1) A friend lived in a hollow where the oil truck had to go up and down steep hills. He swore that action stirred up whatever was in the truck's tank and got real good at cleaning/replacing orifices.
I always thought oil delivery trucks pumped from the bottom so their trucks stayed as contaminate-free as possible
Im on a steep hill.
But im sure the stop ligts and snakey roades around here still thing up just fine.
Of coures it teh fill of teh home tank thts stirring up sediment.
Age old problem with gas and oil
and Service Stations.
Remember the old guys telling you " dont get gas when they are filling the tanks!"
Now you have E10 then if that get jat a a little water in it, now ALL of that is on the bottom!
and you have 85 or less octane regular phase separated on top.
Happens many time a year to me.
An this is an engine killer.