My 370Z sits right around 200-215 when operating temperature is reached no matter for 5W30 synthetic motor oil I use which is normal temperature according to a lead Nissan automotive technician I talked to before he said use what ever oil motor that works best in your vehicle. I will be sticking with 5W30. I think 0W20 and 5W20 is way too thin. I found out one of our local Nissan dealership service departments is using Mobil 1 Synthetic 5W30 and Valvoline SynPower Synthetic 5W30 on all oil changes in Nissan 370Z’s and Nissan GTR’s. I have been using Valvoline SynPower Synthetic 5W30 and a Mobil 1 oil filter on all my oil changes. My advice is on your next oil change send a sample of your oil motor oil off to get tested and post up the results. Then you will see how great the motor oil you are using is.

Sometimes things fall through the cracks and this one one of them. IBTL.