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.
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