Oil viscosity/ oil temps

[cycleguy55]

Originally Posted by cobragene

I should have been more clear. Tommy #2. I am running vr1 20-50 synthetic 6qts and my running oil temps are about 160F 1hour running in 50F ambient 2500rpm, Oil cooler is bypassed. Would the lighter oil run at a higher temp? I believe 160 is to low correct? Pressures are high enough that I could use a combo of the two oils?

160°F? That begs the following:

1. How long has the engine been running before reaching that temperature?
2. What kind of load has it been subjected to before reaching 160°F? (e.g. track, highway running, stop and go driving, idling)?
3. Is the temperature stable over a period of time, an hour or more?
4. Are you sure your temperature gauge is accurate?
5. Have you validated the temperature with another device, such as another gauge or a temperature gun?

My oil temperature gauge (in the sump) typically reads 210-220°F after driving for at least 30 minutes, including highway driving - but it takes a long time to get there, as I have an 11-quart oil pan. 100% synthetic 5W30. BTW, when I ran 5W30 dino oil the temperatures were typically about 10°F higher than they are with the synthetic oil.

I run a 180°F thermostat, and coolant temperature is typically around 190-210°F, depending upon traffic, ambient temperature, etc.