How can the pressure go up if the flow decreases, and how can the the pressure go down if the flow increases when a PD oil pump is moving the oil?In fact the relationship between pressure and flow is in opposition. If you change your oil to a thicker formula the pressure will go up. It goes up because the resistance to flow is greater and in fact the flow must go down in order for the pressure to go up. They are inversely related. Conversely if you choose a thinner oil then the pressure will go down. This can only occur if the flow has increased.
Look it up in a dictionary, English words have many meanings.Thick and thin could be debated too, how can two words describe two completely different things? I guess it’s English. Thick and thin to me really mean a length measurement. Low viscosity oil isn’t thinner than high viscosity as far as how wide they are.
Continuing on this program are we? Same old same old. You look it up for yourself. I already mentioned that it's English. Same word more than one meaning. Maybe your reading is too thin.Look it up in a dictionary, English words have many meanings.
having or being of relatively great depth or extent from one surface to its opposite; heavily built : thickset; close-packed with units or individuals… See the full definitionwww.merriam-webster.com
But what is winter??? I know it starts December 21 but we can have 80 degrees...is that winter? I think the W is just a way of separating the the two numbers, any letter, asterisk, or a dash could be used to separate the two. W is just a letter that was at one time used to denote that was the viscosity rating for the winter time and has just remained over time. Today the measurements are at done at specified temperatures and denotes that the oil labeled such pass the test in the within the allowable parameters.