Quote Originally Posted by J R Jones View Post
High RPM and power create the energy and flow to heat the oil. At idle you are making little power, energy or flow. Testing for your highest oil temperature requires high load and high RPM. 200F is a good temperature and 270F is an upper limit. 300F is bad. Oil pressure is high with cold oil because thick oil does not flow easily. At operating temperature and higher RPM the oil pressure is regulated and you see that on the gauge, although by positioning the pressure sensor away from the pump the reading is less accurate. 5W vs 10W is significant to distributing oil when cold and the cold pressure issue is discussed above. Hot 30W vs hot 40W will not be distinguished by your gauge.
What I am getting at is there an issue with my pressure relief valve or is this overly high pressure due to cold and heavier break in oil?