Yes, we do change our oil. Motor oil, transfer case oil, transmission oil, differential oil, and even muffler oil.
Much of it depends on weather you are driving in, number of miles on engine, etc.
Motor oil - Wikipedia, the free encyclopedia
That said, if you need to ask a question like that you should read the owners manual or repair manual.
The Haynes manual I have recommends "API grade SF/CC SF/CD multigrade and fuel efficient oil"
Basically any decent oil will be fine, unless you want to start a brand war on the list.
Under viscosity (and I assume that is what you are asking) shows a chart describing each.
(SAE 5W-30 is what it preferred)
is this what you wanted?
SAE Viscosity Chart - FluidMasters Perth & WA
a quick google for: sae viscosity chart
showed what you want.
sorry to be a pill but no one in the UK has a quality rated oil?
How is your oil rated over there?