Simple one really, running temp on the V8 should be ??

Car runs at around 70-75 when on motorway, barely moves unless i hit a hill, which increases to say 80.

Soon as we stop in traffic it'll creep up and possibly get to 90 or just above.

IS that normal or chould it maintain 80-90 while cruising at motorway speeds? Need to check as oil temperature barely goes above 60-70 no matter what, and concerned that the oil may not be getting hot enough to lubricate correctly.

thanks

Stuart