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Message
Sing that song to your last cooler again,
maybe it will believe. Maybe not. (I know, tackie sa comment, I apologize.)
Too a certain extent, you are or should be absolutely correct, 5w-30 should be
no thicker cold than 5 and no thinner hot than 30, but, why chance it ? It
also shouldn't have any more pressure, period, than bypass allows but something
obviously causes oil to act differently than water, with coolers
anyway; and, while hydraulic pressure is hydraulic pressure, fluid density,
compressibility difference, whatever, seems to be a good a guess as any; and,
one perhaps easily avoided by thermostatically controlled relief
valve. Why beat the poor little sucker to death waiting for oil to reach
140, if it does have any effect ?
jofarr
I disagree. I'm using 5W-30, so when it's
cold, cold, cold, the oil still isn't thick, thick, thick :-) Also,
airplane guys are kind to their engines. We crank them, and allow them
to gently warm up before running them hard. This is very different from
how it would be used in the car, which I suspect is why Mazda included the oil
thermostat. The only hassle is waiting for it to get 140 degrees before
takeoff. I see the thermostat as being nice, but not
necessary.
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