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Engine Oil Design

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Skippydiesel

Well-Known Member
Joined
Oct 18, 2020
Messages
216
That is not correct. The by-pass valve prevents oil starvation when cold, thick oil is clogging the cooler. It also prevents oil starvation if the cooler becomes clogged with debris/sludge. Dependant on the susceptibility of the cooler to these issues, the latter functions can be vastly more important than a fast warm-up. The by-pass does need to be checked, including for correct orientation. Removal for test purposes is reasonable. However, the first priority in this instance is check and calibration of the instrumentation - replacing the instrument does not in itself assure that the temperature data is correct.
Don't know what oils you are using , under what conditions but your knowledge would seem to pre date the use of multigrade & synthetic oils. Sludge? Cold . thick oil? - ancient history my friend. We now have oils that start at 0 (not that I like the idea) that pour like water, when cold and detergents that have consigned "sludge" to the memory of my youth.
 
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