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Old 11-28-2017, 09:18 PM   #11
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Originally Posted by Mactheplumber View Post
How would not being hot enough hurt anything? After the oil is nice and warmed up the rest of the temperature is just, extra temperature isn't it? I'm not a physics major but I can't see any additional heat past that required to make the oil function correctly be anything but excessive.

at what temperature does a multi-viscosity oil operate most efficiently?

my guess would be somewhere close to 192 degrees. (89 C)

perhaps we should ask Bob the oil guy
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Old 11-28-2017, 11:14 PM   #12
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At some point Ford discovered (they pioneered the hotter running engines, so I hear) that running engines at 197 degrees kept the moisture unburned fuel out of the oil and engines actually last longer running this way. They are also more efficient because your combustion temperature is closer to the temperature of the cylinder walls at higher temps, which means more combustion is transfered to work than to your coolant.

Then there is the computer. Your car is tuned to run at the temperature that it was designed to run.

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Old 11-29-2017, 01:55 PM   #13
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Originally Posted by pjtoledo View Post
back in the 60s guys would take thermostats out thinking they would get more power. while power gains were mostly imaginary, the burnt exhaust valves were definitely real. only took a few weeks, even less on long road trips.
While I never did that, I have always taken to remove thermostats and replace them with slightly cooler ones. My Ranger has had a 180 in it for almost the entire 18 years I've owned it. Temp gauge still gets to nearly the halfway mark on the gauge when warmed up. The needle is only slightly lower on the gauge than it had been with the 195.

My Lightning, like all Lightnings, came with a 180. Mine has a 170 now. Net affect was a slight drop of the needle on the gauge.

Some years ago I had tried putting a 160 in the Ranger. Got the code telling me operating temperature was not warm enough for the computer to make the switch from Open Loop to Closed Loop. Put the 180 back in, deleted the code. Been fine since.

I'd never run without a thermostat. That's just dumb.

Oh, also been running 20W-50 oil in the Ranger the entire 18 years I've owned it. Used to be the local oil shops would change it. Now they tell me it is a 5W-20 motor, and refuse. They are so ****ing stupid. I don't even recall 5W-20 oil existing in 98.

My Lightning is a 5W-20 motor, and I use 10W-30 in it. Gone back to changing the oil myself since the stupid shops refuse to if you don't want colored water in your crankcase. And that's what 5W-20 oil is, colored water.
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